Human Anatomy and Physiology: Body Organization, Terminology, and Cell Basics

Comprehensive practice flashcards covering cell organelles, feedback mechanisms, directional terms, anatomical body planes, body cavities, serous membranes, abdominopelvic divisions, and surface anatomical regions.

Homeostasis

The physiological process that keeps the body's internal environment stable.

Negative Feedback

A control mechanism that reverses a change to return the body toward normal (e.g., regulation of body temperature, blood glucose, and blood pressure).

Positive Feedback

A mechanism that strengthens a change until a specific event is completed (e.g., childbirth and blood clotting).

Anatomical Position

The standard body reference position: standing erect, facing forward, with upper limbs at the sides and palms supinated (facing forward) so the radius and ulna are nearly parallel.

Superior

A directional term of relative position indicating a part situated above another part or closer to the head.

Inferior

A directional term of relative position indicating a part situated below another part or toward the feet.

Medial

A directional term referring to a position closer to the midline of the body.

Lateral

A directional term referring to a position farther from the midline, toward the side of the body.

Proximal

A directional term describing a body part that is closer to a point of attachment to the trunk than another part.

Distal

A directional term describing a body part that is farther from a point of attachment to the trunk than another part.

Sagittal (Median / Midsagittal) Plane

A lengthwise vertical plane passing through the midline that divides the body into equal right and left halves.

Parasagittal Plane

A vertical plane parallel to the median plane that divides the body into unequal right and left portions.

Frontal (Coronal) Plane

A plane section dividing the body into anterior (front) and posterior (back) portions.

Transverse (Horizontal) Plane

A horizontal plane section dividing the body into superior (upper) and inferior (lower) portions.

Cross Section

A cut across a cylindrical organ or body tube made perpendicular to its long axis.

Oblique Section

An angular or diagonal cut across an organ or body tube.

Longitudinal Section

A lengthwise cut running parallel to the long axis of an organ or body tube.

Cranial Cavity

The body cavity located within the skull that houses the brain.

Spinal Cavity

The tubular cavity extending through the vertebral column that encloses the spinal cord.

Thoracic Cavity

The upper ventral cavity above the diaphragm containing the heart, lungs, and mediastinal structures.

Diaphragm

The muscular sheet separating the thoracic cavity from the abdominopelvic cavity.

Abdominopelvic Cavity

The large body cavity inferior to the diaphragm, composed of the superior abdominal cavity and inferior pelvic cavity.

Visceral Pleura

The serous membrane layer adhering directly to the external surface of the lung.

Parietal Pleura

The serous membrane layer lining the thoracic cavity wall enclosing each lung.

Pleural Cavity

The fluid-filled potential space situated between the visceral and parietal pleurae.

Visceral Pericardium (Epicardium)

The serous membrane covering the outer surface of the heart.

Parietal Pericardium

The outer serous layer of the pericardial sac, covered externally by the fibrous pericardium.

Pericardial Cavity

The potential space located between the visceral and parietal pericardia surrounding the heart.

Visceral Peritoneum

The serous membrane covering the exterior surfaces of the abdominopelvic organs.

Parietal Peritoneum

The serous membrane lining the internal wall of the abdominal cavity.

Peritoneal Cavity

The potential space between the visceral and parietal peritoneal membranes.

Abdominopelvic Quadrants

Four divisions of the abdominopelvic cavity used for clinical localization: Right Upper Quadrant (RUQ), Left Upper Quadrant (LUQ), Right Lower Quadrant (RLQ), and Left Lower Quadrant (LLQ).

Epigastric Region

The upper central region of the nine abdominopelvic regions, situated superior to the umbilical region.

Umbilical Region

The central region of the nine abdominopelvic regions, surrounding the navel.

Pubic Region

The lower central region of the nine abdominopelvic regions, located inferior to the umbilical region.

Hypochondriac Regions

The upper lateral abdominopelvic regions located on either side of the epigastric region.

Lateral Regions (Right and Left)

The middle lateral abdominopelvic regions flanking the central umbilical region.

Inguinal Regions

The lower lateral abdominopelvic regions situated on either side of the pubic region.

Cephalic

Anatomical regional term referring to the head.

Frontal

Anatomical regional term referring to the forehead.

Orbital

Anatomical regional term referring to the eye.

Otic

Anatomical regional term referring to the ear.

Nasal

Anatomical regional term referring to the nose.

Buccal

Anatomical regional term referring to the cheek.

Oral

Anatomical regional term referring to the mouth.

Mental

Anatomical regional term referring to the chin.

Occipital

Anatomical regional term referring to the posterior (back) of the head.

Cervical

Anatomical regional term referring to the neck.

Acromial

Anatomical regional term referring to the point of the shoulder.

Axillary

Anatomical regional term referring to the armpit.

Brachial

Anatomical regional term referring to the arm.

Antecubital

Anatomical regional term referring to the anterior surface of the elbow.

Cubital

Anatomical regional term referring to the posterior elbow.

Antebrachial

Anatomical regional term referring to the forearm.

Carpal

Anatomical regional term referring to the wrist.

Palmar

Anatomical regional term referring to the palm of the hand.

Digital

Anatomical regional term referring to the fingers or toes.

Sternal

Anatomical regional term referring to the middle of the thorax (anterior chest over the sternum).

Pectoral

Anatomical regional term referring to the chest.

Mammary

Anatomical regional term referring to the breast.

Abdominal

Anatomical regional term referring to the abdomen.

Umbilical

Anatomical regional term referring to the navel.

Coxal

Anatomical regional term referring to the hip.

Inguinal

Anatomical regional term referring to the groin.

Genital

Anatomical regional term referring to the reproductive organs.

Dorsal

Anatomical regional term referring to the back.

Vertebral

Anatomical regional term referring to the spinal column.

Lumbar

Anatomical regional term referring to the loin or lower back.

Sacral

Anatomical regional term referring to the posterior region situated between the hips.

Gluteal

Anatomical regional term referring to the buttocks.

Perineal

Anatomical regional term referring to the region between the anus and the genitals.

Femoral

Anatomical regional term referring to the thigh.

Patellar

Anatomical regional term referring to the anterior knee.

Popliteal

Anatomical regional term referring to the posterior knee.

Crural

Anatomical regional term referring to the leg (anterior lower leg).

Sural

Anatomical regional term referring to the calf (posterior lower leg).

Tarsal

Anatomical regional term referring to the ankle.

Pedal

Anatomical regional term referring to the foot.

Plantar

Anatomical regional term referring to the sole of the foot.