Unit 1: Organization of the Human Body

A set of vocabulary flashcards based on Unit 1 notes covering human body organization, organ systems, regional anatomy, directional terminology, body planes/cavities, and homeostatic feedback mechanisms.

Anatomy

The study of physical structures within an organism, including their appearance and location.

Physiology

The study of how physical structures within an organism function.

Integumentary System

The organ system that provides protection, prevents water loss and gain, synthesizes vitamin D, releases secretions, regulates body temperature, and houses sensory receptors.

Skeletal System

The organ system that provides support and protection, serves as the site of hematopoiesis (blood cell production), stores calcium and phosphorus, and provides sites for ligament and muscle attachments.

Muscular System

The organ system that produces body movement, generates heat, and maintains posture.

Nervous System

The organ system that responds to sensory stimuli, controls muscles and some glands, and is responsible for consciousness, intelligence, and memory.

Endocrine System

The organ system consisting of glands and cell clusters that secretes hormones to regulate development, growth, metabolism, blood composition, digestive processes, and reproductive functions.

Cardiovascular System

The organ system consisting of the heart and blood vessels that moves blood, distributes hormones, nutrients, and gases, and removes waste products.

Lymphatic System

The organ system that transports and filters lymph (fluid that leaks from blood vessels) and may participate in an immune response.

Respiratory System

The organ system responsible for exchanging gases (oxygen and carbon dioxide) between the blood and the air in the lungs.

Digestive System

The organ system that mechanically and chemically breaks down food, absorbs nutrients, and expels waste products.

Urinary System

The organ system that filters blood to remove waste products, concentrates waste into urine, expels urine, and regulates blood pressure and pH.

Reproductive System

The organ system that produces sex cells (gametes) and sex hormones, enabling reproduction.

Axial Region

The main body partition forming the central vertical axis of the body, which includes the head, neck, and trunk.

Appendicular Region

The body partition that includes the upper and lower limbs.

Anterior (Ventral)

An anatomical direction meaning in front of or toward the front/belly side of the human body.

Posterior (Dorsal)

An anatomical direction meaning in back of or toward the back side of the human body.

Superior

An anatomical direction meaning closer to the head.

Inferior

An anatomical direction meaning closer to the feet.

Cranial (Cephalic)

An anatomical direction meaning toward the head end.

Caudal

An anatomical direction meaning toward the rear or tail end.

Rostral

An anatomical direction meaning toward the nose or mouth.

Medial

An anatomical direction meaning toward the midline of the body.

Lateral

An anatomical direction meaning away from the midline of the body.

Ipsilateral

An anatomical direction meaning on the same side of the body.

Contralateral

An anatomical direction meaning on the opposite side of the body.

Deep

An anatomical direction meaning closer to the inside, internal to another structure.

Superficial

An anatomical direction meaning closer to the outside, external to another structure.

Proximal

An anatomical direction meaning closer to the point of attachment to the trunk.

Distal

An anatomical direction meaning farther away from the point of attachment to the trunk.

Coronal Plane

A vertical plane that divides the body into anterior (front) and posterior (back) parts; also referred to as the frontal plane.

Transverse Plane

A horizontal plane that divides the body into superior (top) and inferior (bottom) parts; also referred to as a cross-sectional plane.

Midsagittal Plane

A vertical plane dividing the body into equal left and right halves along the midline; also referred to as the median plane.

Sagittal Plane

A plane parallel to the midsagittal plane that divides a structure into unequal left and right portions; also referred to as parasagittal.

Oblique Plane

A plane that passes through a body structure at an angle.

Abdominopelvic Regions

The nine compartments partitioning the abdominopelvic cavity: right hypochondriac, epigastric, left hypochondriac, right lumbar, umbilical, left lumbar, right iliac, hypogastric, and left iliac regions.

Abdominopelvic Quadrants

The four compartments created by transverse and midsagittal planes passing through the umbilicus: Right Upper Quadrant (RUQ), Left Upper Quadrant (LUQ), Right Lower Quadrant (RLQ), and Left Lower Quadrant (LLQ).

Parietal Serous Membrane

The outer layer of a serous membrane that lines the internal surface of the body wall.

Visceral Serous Membrane

The inner layer of a serous membrane that directly covers the external surface of organs (viscera).

Serous Fluid

A liquid secreted by cells in a serous membrane that fills the serous cavity and acts as a lubricant to reduce friction from moving organs.

Mediastinum

The median space within the thoracic cavity containing the heart, thymus, esophagus, trachea, and major blood vessels connected to the heart.

Pericardium

The two-layered serous membrane surrounding the heart, composed of the outer parietal pericardium, inner visceral pericardium, and fluid-filled pericardial cavity.

Pleura

The two-layered serous membrane associated with the lungs, consisting of parietal pleura, visceral pleura, and pleural cavity.

Peritoneum

The two-layered serous membrane lining the abdominopelvic cavity, consisting of parietal peritoneum, visceral peritoneum, and peritoneal cavity.

Homeostasis

The ability of an organism to maintain a consistent internal environment in response to changing internal or external conditions.

Receptor

The component of a homeostatic control system that detects changes in a variable stimulus.

Control Center

The component of a homeostatic system (usually the brain or an endocrine gland) that integrates sensory input and initiates change through an effector.

Effector

The component of a homeostatic system (such as a muscle or gland) that brings about changes to alter the stimulus.

Negative Feedback Mechanism

A homeostatic control system where the resulting action moves the variable in the opposite direction of the stimulus to keep it within a normal set point range.

Positive Feedback Mechanism

A homeostatic control system where the stimulus is reinforced to move the variable in the same direction until a climactic event occurs.

Chemoreceptors

Receptors that detect chemical concentrations, such as neurotransmitters, drugs, or hormones.

Osmoreceptors

Receptors that detect changes in osmolarity, such as water and ion concentrations.

Baroreceptors

Receptors that detect changes in blood pressure.

Nociceptors

Receptors that detect pain stimuli.

Thermoreceptors

Receptors that detect temperature changes.