Overview of Physiology Topics for Science Assessment

Overview of Physiology Topics for Science Assessment

This guide outlines the major physiological systems and concepts assessed in the science section of the exam. Each topic is foundational to understanding human Anatomy & Physiology at the college level.

Cardiovascular System

The cardiovascular system is responsible for transporting blood, nutrients, gases, and wastes throughout the body. It consists of the heart, blood vessels, and blood.

• Heart: Pumps blood through two main circuits: pulmonary (to the lungs) and systemic (to the body).

• Blood vessels: Include arteries, veins, and capillaries.

• Key function: Maintains blood pressure and tissue perfusion.

Example: The heart's left ventricle pumps oxygenated blood into the aorta for systemic circulation.

Electrolytes

Electrolytes are ions in body fluids that are essential for nerve conduction, muscle contraction, and fluid balance.

• Major electrolytes: Sodium (Na+), potassium (K+), calcium (Ca2+), chloride (Cl-), bicarbonate (HCO3-).

• Role: Maintain osmotic balance and acid-base homeostasis.

Example: Imbalances in potassium can cause cardiac arrhythmias.

Gastrointestinal System

The gastrointestinal (GI) system is responsible for digestion, absorption of nutrients, and elimination of waste.

• Main organs: Mouth, esophagus, stomach, intestines, liver, pancreas.

• Key processes: Mechanical and chemical breakdown of food, nutrient absorption.

Example: The small intestine absorbs most nutrients from digested food.

Immune System

The immune system defends the body against pathogens and foreign substances.

• Components: White blood cells, lymphoid organs (e.g., spleen, lymph nodes), antibodies.

• Types of immunity: Innate (nonspecific) and adaptive (specific).

Example: Vaccines stimulate adaptive immunity by exposing the body to antigens.

Neurology

Neurology is the study of the nervous system, including the brain, spinal cord, and peripheral nerves.

• Functions: Sensory input, integration, motor output, cognition.

• Divisions: Central nervous system (CNS) and peripheral nervous system (PNS).

Example: Reflex arcs allow for rapid, involuntary responses to stimuli.

Renal System

The renal system (urinary system) regulates fluid and electrolyte balance, removes waste, and maintains acid-base homeostasis.

• Main organs: Kidneys, ureters, bladder, urethra.

• Key function: Filtration of blood to form urine.

Example: The nephron is the functional unit of the kidney.

Hematological System

The hematological system involves the study of blood, its components, and their functions.

• Main components: Red blood cells, white blood cells, platelets, plasma.

• Functions: Oxygen transport, immune defense, clotting.

Example: Hemoglobin in red blood cells binds oxygen for transport.

Homeostasis

Homeostasis is the maintenance of a stable internal environment despite external changes.

• Mechanisms: Negative feedback (most common), positive feedback (less common).

• Examples: Regulation of body temperature, blood glucose levels.

Example: The body sweats to cool down when overheated (negative feedback).

Respiratory System

The respiratory system is responsible for gas exchange—supplying oxygen and removing carbon dioxide.

• Main organs: Nose, pharynx, larynx, trachea, bronchi, lungs.

• Key process: Alveolar gas exchange.

Example: Oxygen diffuses from alveoli into pulmonary capillaries.

Sensory System

The sensory system detects and processes environmental stimuli, allowing perception of the world.

• Main senses: Vision, hearing, taste, smell, touch.

• Receptors: Specialized cells that convert stimuli into nerve impulses.

Example: Photoreceptors in the retina detect light for vision.