Introduction to Human Anatomy and Physiology

Flashcards covering the fundamentals of human anatomy and physiology, including levels of organization, organ systems, life functions, survival needs, anatomical terminology, and homeostatic control mechanisms.

What is the primary difference between anatomy and physiology?

Anatomy is the study of the structure and shape of the body and its parts, whereas physiology is the study of how the body and its parts work or function.

Two Subdivisions of Dorsal body cavity

Explain the concept that 'structure determines function' using the lungs as an example.

The structure of a body part allows for specific tasks; for instance, the lungs can exchange gases because their air sacs have very thin walls, but they cannot pump blood because they are not muscular chambers like the heart.

What are the two subdivisions of anatomy defined by the size of the structures being studied?

Gross anatomy involves studying large, easily observable structures like the heart or bones, while microscopic anatomy involves studying structures like cells and tissues that require a microscope to be seen.

List the six levels of structural organization in the human body from simplest to most complex.

The levels are the chemical level, cellular level, tissue level, organ level, organ system level, and organismal level.

How many organ systems make up the human organism?

The human body is composed of $11$ organ systems.

Whic system performs the functions of waterproofing the body, producing vitamin D, and regulating body temperature through perspiration?

The integumentary system, which includes the skin, hair, and fingernails.

What are three functions of the skeletal system mentioned in the notes?

It provides a framework for movement, protects organs (such as the brain), and serves as the site for blood cell formation and mineral storage.

Identify the two control systems of the body and their primary difference in speed.

The nervous system is the fast-acting control system that uses electrical nerve impulses, while the endocrine system is a slower control system that uses chemical hormones.

What is the primary role of the lymphatic system?

It returns fluid leaked from blood vessels back to the bloodstream, cleanses the blood, and houses white blood cells for immunity.

Which organ system is responsible for removing nitrogen-containing wastes like urea and uric acid from the blood?

The urinary system, which is also called the excretory system.

Name the eight necessary life functions humans must perform to maintain life.

Maintaining boundaries, movement, responsiveness (irritability), digestion, metabolism, excretion, reproduction, and growth.

What are the five survival needs of the human body?

Nutrients, oxygen, water, appropriate temperature, and appropriate atmospheric pressure.

What percentage of body weight is accounted for by water?

Water accounts for $60$ to $80$ percent of body weight.

What is the normal body temperature requirement for maintaining life-sustaining metabolic reactions?

Normal body temperature is $37\,^\circ C$ ($98.6\,^\circ F$).

Describe the anatomical position.

The body is erect, feet are parallel, and arms hang at the sides with the palms facing forward and thumbs pointing away from the body.

Define the directional terms 'proximal' and 'distal'.

Proximal means close to the origin of the body part or point of attachment of a limb; distal means farther from the origin or point of attachment.

Distinguish between 'superficial' and 'deep'.

Superficial (external) refers to being toward the body surface, while deep (internal) refers to being away from the body surface.

What are the three types of body planes or sections?

The sagittal section (divides right and left), frontal or coronal section (divides anterior and posterior), and transverse or cross section (divides superior and inferior).

Which body cavity is subdivided into the cranial and spinal cavities?

The dorsal body cavity.

What structure separates the thoracic cavity from the abdominopelvic cavity in the ventral body cavity?

The diaphragm.

Name the four quadrants used by medical personnel to divide the abdominopelvic cavity.

The right upper quadrant ($RUQ$), right lower quadrant ($RLQ$), left upper quadrant ($LUQ$), and left lower quadrant ($LLQ$).

What are the three essential components of a homeostatic control system?

The receptor (sensor), the control center (analyzer), and the effector (responder).

What is the difference between negative and positive feedback mechanisms?

Negative feedback reduces or shuts off the original stimulus (e.g., body temperature regulation), whereas positive feedback increases the original disturbance (e.g., blood clotting or childbirth).

What is the risk of homeostatic imbalance as humans age?

As we age, organs become less efficient and internal conditions become less stable, increasing the risk for illness and generating the changes associated with aging.