Anatomy Unit 1 Vocab

anatomy

The study of the physical structure, shape, and organization of organisms and their parts

physiology

The study of the chemical and physical functions and processes of living organisms and their parts

structures

The physical components, organs, or tissues that make up an organism's body (how things are built)

functions

The active processes, mechanisms, and roles performed by biological structures (how things work)

atoms

The smallest units of a chemical element that retain the properties of that element

subatomic particles

The tiny constituent parts of an atom, primarily protons, neutrons, and electrons

molecules

Chemically bonded groups of two or more atoms

macromolecules

Very large, complex molecules composed of many smaller subunits, including proteins, lipids, carbohydrates, and nucleic acids

cell

The microscopic structural, functional, and biological unit of all living organisms; the basic unit of life

organelle

A specialized, membrane-bound subunit within a cell that performs a specific metabolic or structural task

tissue

A group of similar, specialized cells that work together to perform a common, specific function

organs

A structured body part composed of two or more different types of tissues that collaborate to perform a specific function

organ systems

A group of closely related organs that work together to perform major, coordinated physiological functions

organism

An individual living entity, representing the highest level of biological and structural organization

metabolism

The sum total of all physical and chemical reactions that occur within a living organism to maintain life

water

The most abundant chemical substance in the body; acts as an essential solvent, reaction medium, transport vehicle, and temperature regulator

food

Substances that provide essential nutrients, serving as sources of energy, raw building materials, and vital chemical regulators

oxygen

A gas required by cells to release energy from nutrients via cellular respiration

heat

A form of kinetic energy produced as a byproduct of metabolic processes; helps regulate the rate of chemical reactions in the body

pressure

An applied force, such as atmospheric pressure for breathing or hydrostatic pressure (blood pressure) for blood circulation

homeostasis

The dynamic maintenance of a stable, relatively constant internal environment within narrow physiological limits

homeostatic mechanisms

Self-regulating control systems (composed of receptors, a control center, and effectors) that work together to maintain homeostasis

receptors

Sensors that monitor the internal or external environment, detect specific changes (stimuli), and send signals to a control center

control center

The integration center (typically the brain) that evaluates incoming sensory data, compares it against a set point, and determines the response

set point

The target, ideal, or optimal value for a physiological parameter (such as body temperature)

effectors

Organs, muscles, or glands that execute the physiological responses directed by the control center to counteract or reinforce a stimulus

negative feedback

The primary regulatory mechanism of homeostasis, where the response opposes or reverses the direction of the initial change to return conditions toward normal

normal range

The narrow, acceptable limits of variation around a set point in which body systems can still function safely and optimally

axial portion

The central structural axis of the body, encompassing the head, neck, and trunk

appendicular portion

The parts of the body consisting of the upper and lower limbs and their associated bony girdles

cranial cavity

The bony space inside the skull that houses, cushions, and protects the brain

vertebral canal

The hollow, bony canal formed by the vertebrae of the spine that contains, supports, and protects the spinal cord

thoracic cavity

The chest cavity located superior to the diaphragm, containing the lungs, heart, esophagus, and trachea

abdominopelvic cavity

The large ventral cavity inferior to the diaphragm, divided into the abdominal and pelvic cavities

viscera

The collective term for the internal organs located within the thoracic and abdominopelvic cavities

diaphragm

A dome-shaped sheet of skeletal muscle that separates the thoracic cavity from the abdominal cavity; the main muscle of respiration

mediastinum

The central partition of the thoracic cavity between the lungs, containing the heart, thymus, esophagus, trachea, and major blood vessels

abdominal cavity

The superior portion of the abdominopelvic cavity, containing the stomach, liver, spleen, gallbladder, kidneys, and most of the intestines

pelvic cavity

The inferior portion of the abdominopelvic cavity, bounded by hip bones, containing the urinary bladder, rectum, and internal reproductive organs

serous membranes

Thin, double-layered, fluid-secreting membranes that line closed thoracic and abdominopelvic cavities and cover their internal organs

pleural membranes

The serous membranes associated with the lungs; parietal pleura lines the chest wall, and visceral pleura adheres directly to the lungs

pericardial membranes

The serous membranes that surround the heart; parietal pericardium lines the outer sac, and visceral pericardium covers the heart muscle

peritoneal membranes

The serous membranes of the abdominopelvic cavity; parietal peritoneum lines the cavity wall, and visceral peritoneum covers the abdominal organs

integumentary system

Composed of skin, hair, nails, and glands; provides protection, temperature regulation, and sensory reception

skeletal system

Composed of bones, cartilages, and ligaments; provides structural support, protects vital organs, houses blood cell production, and stores minerals

muscular system

Composed of skeletal muscles; enables body movement, maintains posture, and generates body heat

nervous system

The rapid-acting control and communication network of the brain, spinal cord, nerves, and receptors

endocrine system

Composed of hormone-secreting glands (e.g., thyroid, adrenal, pancreas); regulates metabolism, growth, and reproduction

cardiovascular system

The transport network of the heart, blood vessels, and blood; distributes oxygen, carbon dioxide, nutrients, and waste products

lymphatic system

A system of lymph vessels, nodes, and organs; drains excess interstitial fluid, absorbs dietary lipids, and fights infections

digestive system

The pathway of the mouth, esophagus, stomach, and intestines; breaks down food, absorbs nutrients, and excretes solid waste

respiratory system

Composed of the nasal cavity, trachea, bronchi, and lungs; exchanges oxygen and carbon dioxide between the external air and bloodstream

urinary system

Composed of the kidneys, ureters, bladder, and urethra; filters blood, removes metabolic wastes, and regulates water and pH balance

excretion

The physiological process of eliminating toxic metabolic wastes from the body

reproductive system

The male and female systems responsible for producing sex cells, synthesizing sex hormones, and producing/nurturing offspring

aging

The progressive, time-dependent decline in physiological and homeostatic mechanisms, leading to reduced functionality

anatomical position

The standard, universally accepted reference posture: standing erect, facing forward, arms at sides, with palms and toes pointing forward

superior

Directional term meaning above, over, or closer to the head

inferior

Directional term meaning below, under, or closer to the feet

anterior

Directional term meaning toward the front of the body (synonymous with ventral)

posterior

Directional term meaning toward the back of the body (synonymous with dorsal)

medial

Directional term meaning closer to the imaginary midline of the body

lateral

Directional term meaning further away from the imaginary midline of the body

bilateral

Pertaining to or involving both the left and right sides of the body

ipsilateral

Located on or affecting the same side of the body

contralateral

Located on or affecting the opposite side of the body

proximal

Directional term meaning closer to the point of attachment, limb origin, or trunk of the body

distal

Directional term meaning further away from the point of attachment, limb origin, or trunk of the body

superficial

Directional term meaning closer to the outer surface of the body

peripheral

Directional term meaning away from the center or core of the body or an organ

deep

Directional term meaning further inward, away from the surface of the body

sagittal

A vertical plane that divides the body or an organ into right and left portions

transverse

A horizontal plane that divides the body or an organ into superior and inferior portions

frontal

A vertical plane that divides the body or an organ into anterior and posterior portions

cross-section

A clean cut perpendicular (at a 90-degree angle) to the long axis of a three-dimensional structure

oblique

An angled cut or section made at any direction other than 90 degrees or parallel to the long axis

longitudinal

A cut or section made parallel to the long axis of a three-dimensional structure

epigastric region

The upper middle region of the abdomen, located superior to the umbilical region

left/right hypochondriac regions

The regions on the left and right sides of the epigastric region, inferior to the rib cartilage

umbilical region

The central region of the abdomen, surrounding the navel

left/right lumbar regions

The regions on the left and right sides of the umbilical region, situated in the lower back area

hypogastric region

The lower middle region of the abdomen, located inferior to the umbilical region

left/right iliac regions

The regions on the left and right sides of the hypogastric region, also called the inguinal regions

abdominal quadrants

The four divisions of the abdomen (Right Upper, Left Upper, Right Lower, Left Lower) used to clinically localize organs

abdominal

Pertaining to the region of the abdomen between the thorax and pelvis

acromial

Pertaining to the point of the shoulder

antebrachial

Pertaining to the forearm

antecubital

Pertaining to the space or depression in front of the elbow

axillary

Pertaining to the armpit

brachial

Pertaining to the arm (specifically the upper arm between the shoulder and elbow)

buccal

Pertaining to the cheek

carpal

Pertaining to the wrist

celiac

Pertaining to the abdomen

cephalic

Pertaining to the head

cervical

Pertaining to the neck

costal

Pertaining to the ribs

coxal

Pertaining to the hip

crural

Pertaining to the leg (specifically the lower leg between the knee and ankle)

cubital

Pertaining to the elbow

digital

Pertaining to the fingers or toes