lecture exam 4 ( connect chapter summaries)

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123 Terms

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Muscles

Organs made of cells specialized to generate forces.

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Types of muscle tissue

Skeletal, smooth, and cardiac.

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Structure of a Skeletal Muscle

Composed of nervous, vascular, and connective tissues, as well as skeletal muscle tissue.

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Fascia

Connective tissue covering each skeletal muscle.

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Skeletal muscle fibers

Cylindrical cells with many nuclei, containing mitochondria, sarcoplasmic reticulum, and myofibrils of actin and myosin.

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Sarcomeres

Repeating patterns of striations formed by the arrangement of actin and myosin filaments.

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Neuromuscular junction

Functional connection between a neuron and a muscle fiber.

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Muscle fiber contraction

Results from a sliding movement of actin and myosin filaments overlapping, shortening the muscle fiber.

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Excitation-contraction coupling

Process where stimulation causes the sarcoplasmic reticulum to release calcium ions, leading to the formation of cross-bridges between actin and myosin.

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Oxygen debt

The amount of oxygen required to react accumulated lactic acid, restore ATP and creatine phosphate supplies after strenuous exercise.

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Muscle fatigue

Loss of a muscle's ability to contract.

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Isotonic contraction

Muscle contraction where the muscle shortens.

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Isometric contraction

Muscle contraction where the muscle does not change length.

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Smooth muscle

Contains filaments of myosin and actin, but not organized into myofibrils. Can change length without changing tautness.

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Cardiac muscle

Contracts for a longer time than skeletal muscle due to transverse tubules supplying extra calcium ions.

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Origin and insertion

The less moveable and more moveable ends of a skeletal muscle attachment to a bone, respectively.

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Agonist

Muscle that causes a specific movement.

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Antagonist

Muscle that resists a movement.

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Synergist

Muscles that work together to perform a specific movement.

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Major Skeletal Muscles

Muscles responsible for various movements in the body.

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Life-Span Changes

Decline in supplies of ATP, myoglobin, and creatine phosphate, muscle mass reduction, and slowing reflexes with age.

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Digestion

The process of mechanically and chemically breaking down foods so that they can be absorbed.

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Alimentary canal

The long tube that extends from the mouth to the anus and is responsible for the processes of ingestion, propulsion, digestion, absorption, and defecation.

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Mucosa

The innermost layer of the alimentary canal wall, responsible for secretion and absorption.

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Submucosa

The layer of the alimentary canal wall that contains blood vessels, nerves, and glands.

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Muscularis

The layer of the alimentary canal wall responsible for mixing and propelling movements.

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Serosa

The outermost layer of the alimentary canal wall, providing protection and support.

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Peristalsis

The coordinated contraction and relaxation of muscles in the alimentary canal wall that propels food forward.

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Innervation

The supply of nerves to a specific area or organ.

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Parasympathetic division

The branch of the autonomic nervous system that generally increases digestive activities.

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Sympathetic division

The branch of the autonomic nervous system that generally inhibits digestive activities.

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Cheeks

The lateral walls of the mouth.

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Lips

Highly mobile structures that have sensory receptors useful in judging the characteristics of food.

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Tongue

A thick, muscular organ that mixes food with saliva and moves it toward the pharynx.

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Palate

The roof of the mouth, consisting of hard and soft portions.

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Teeth

Structures that mechanically break food into smaller pieces, increasing the surface area exposed to digestive actions.

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Salivary glands

Glands that secrete saliva, which moistens food, helps bind food particles, and begins chemical digestion of carbohydrates.

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Pharynx

The passageway for food and air, divided into nasopharynx, oropharynx, and laryngopharynx.

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Esophagus

The muscular tube that carries food from the pharynx to the stomach.

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Stomach

The organ that receives food, mixes it with gastric juice, carries on a limited amount of absorption, and moves food into the small intestine.

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Pancreas

An accessory organ closely associated with the duodenum that produces pancreatic juice containing enzymes for digestion and bicarbonate ions to neutralize chyme.

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Liver

The organ located in the upper-right quadrant of the abdominal cavity that performs various functions, including detoxification, metabolism, and bile secretion.

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Gallbladder

The organ that stores bile produced by the liver and releases it into the small intestine.

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Small intestine

The portion of the digestive system that extends from the pyloric sphincter to the large intestine, where digestion is completed and absorption of nutrients occurs.

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Large intestine

The portion of the digestive system that absorbs water and electrolytes and forms and stores feces.

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Nutrients

Substances obtained from food that are necessary for growth, maintenance, and repair of body tissues.

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Metabolism

The sum of all chemical reactions that occur in the body, including the breakdown and synthesis of molecules.

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Carbohydrates

Organic compounds primarily used to supply cellular energy.

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Lipids

Organic compounds that supply energy and are used to build cell structures, including fats, phospholipids, and cholesterol.

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Triglyceride Metabolism

The liver and adipose tissue control the metabolism of triglycerides.

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Fatty Acid Alteration

Liver enzymes have the ability to change the molecular structures of fatty acids.

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Essential Fatty Acids

Linoleic acid and linolenic acid are essential fatty acids that must be obtained through the diet.

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Cholesterol Regulation

The liver regulates cholesterol levels by either synthesizing or excreting it.

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Lipid Requirements

The specific amounts and types of lipids needed for optimal health are currently unknown.

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Wide Range of Lipid Intakes

Humans can survive with a wide range of lipid intakes.

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Fat-Soluble Vitamin Absorption

Sufficient fat intake is necessary to support the absorption and transport of fat-soluble vitamins.

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Protein Breakdown

Proteins are broken down during digestion, resulting in amino acids that can be used for various purposes.

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Essential Amino Acids

Adults require 8 essential amino acids, while growing children require 10 essential amino acids.

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Complete Proteins

Complete proteins contain adequate amounts of all essential amino acids needed for tissue maintenance and growth.

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Incomplete Proteins

Incomplete proteins lack adequate amounts of one or more essential amino acids.

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Nitrogen Balance

In healthy adults, the gain of protein equals the loss of protein, resulting in a nitrogen balance.

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Positive and Negative Nitrogen Balance

Starving individuals have a negative nitrogen balance, while growing children, pregnant women, and athletes in training usually have a positive nitrogen balance.

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Protein Requirements

Proteins and amino acids are needed to supply essential amino acids and nitrogen for various metabolic processes.

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Energy Expenditures

Energy can be obtained from carbohydrates, fats, or proteins and is crucial for survival.

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Energy Values of Food

The potential energy values of foods are expressed in calories, with carbohydrates and proteins yielding about 4 calories per gram and fats yielding about 9 calories per gram.

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Factors Influencing Energy Requirements

Basal metabolic rate, muscular activity, body temperature, and nitrogen balance are factors that influence energy requirements.

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Energy Balance

Energy balance occurs when caloric intake equals caloric output, resulting in weight maintenance. Positive energy balance leads to weight gain, while negative energy balance leads to weight loss.

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Desirable Weight

Average weights of individuals aged 25-35 years are considered desirable for older individuals as well. Body mass index (BMI) is used to assess weight, with a BMI between 25 and 30 indicating overweight and above 30 indicating obesity.

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Appetite Control

Appetite is the drive that compels us to eat, and hormones such as leptin and ghrelin play a role in controlling appetite.

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Vitamins

Vitamins are organic compounds that are essential for normal metabolic processes and cannot be synthesized in adequate amounts by the body.

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Fat-Soluble Vitamins

Fat-soluble vitamins are carried in lipids, resist heat effects, and include vitamins A, D, E, and K.

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Vitamin A

Vitamin A is synthesized from carotenes, stored in the liver, and required for visual pigment production.

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Vitamin D

Vitamin D is a group of related steroids, can be obtained from certain foods or synthesized in the skin, and promotes calcium and phosphorus absorption.

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Vitamin E

Vitamin E is an antioxidant stored in muscles and adipose tissue, preventing breakdown of fatty acids and stabilizing cell membranes.

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Vitamin K

Vitamin K is found in foods and produced by intestinal bacteria, stored in the liver, and used for blood clotting.

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Water-Soluble Vitamins

Water-soluble vitamins include the B vitamins and vitamin C, are destroyed by cooking or food processing, and play various roles in metabolism.

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Thiamine (Vitamin B1)

Thiamine functions as part of coenzymes that oxidize carbohydrates and synthesize ribose.

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Riboflavin (Vitamin B2)

Riboflavin functions as part of enzymes and coenzymes essential for glucose and fatty acid oxidation.

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Niacin (Vitamin B3)

Niacin functions as part of coenzymes required for glucose oxidation and protein and fat synthesis.

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Pantothenic Acid (Vitamin B5)

Pantothenic acid functions as part of coenzyme A, essential for energy-releasing mechanisms.

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Vitamin B6

Vitamin B6 functions as coenzymes in metabolic pathways for protein synthesis and amino acid production.

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Biotin (Vitamin B7)

Biotin is a coenzyme required for amino acid and fatty acid metabolism and nucleic acid synthesis.

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Folacin (Vitamin B9)

Folacin is a coenzyme needed for amino acid metabolism, DNA synthesis

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calat-

something inserted; intercalated disc-membranous band that connects cardiac muscle cells

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erg-

work; synergist-muscle that works with a prime mover, producing a movement

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fasc-

bundle; fasciculus-bundle of muscle fibers

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-gram

something written; myogram-recording of a muscular contraction

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hyper-

over, more; muscular hypertrophy-enlargement of muscle fibers

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inter-

between; intercalated disc-membranous band that connects cardiac muscle cells

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iso-

equal; isotonic contraction-contraction during which the tension in a muscle remains unchanged

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laten-

hidden; latent period-period between a stimulus and the beginning of a muscle contraction

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-lemm

rind or peel; sarcolemma-the cell membrane of a muscle fiber

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myo-

muscle; myofibril-contractile bundle of filaments within a muscle cell

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reticul-

a net; sarcoplasmic reticulum-network of membranous channels within a muscle fiber

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sarco-

flesh; sarcoplasm-substance (cytoplasm) within a muscle fiber

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syn-

together; synergist-muscle that works with a prime mover, producing a movement

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tetan-

stiff; tetanic contraction-sustained muscular contraction

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-tonic

stretched; isotonic contraction-contraction during which the tension of a muscle remains unchanged

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-troph

well fed; muscular hypertrophy-enlargement of muscle fibers

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aliment-

food; alimentary canal-tubelike part of the digestive system