Anatomy & Physiology: Final Exam Study Guide (Selected Systems)

Anatomy & Physiology: Final Exam Study Guide

Chapter 17: The Heart

Structure and Function of the Heart

The heart is a muscular organ responsible for pumping blood throughout the body. Its structure and function are essential for maintaining circulation and delivering oxygen and nutrients to tissues.

• Gross Structure: Includes chambers (atria and ventricles), valves (tricuspid, bicuspid/mitral, pulmonary, aortic), and major blood vessels (aorta, vena cava, pulmonary arteries and veins).

• Blood Flow: Blood flows through the heart in a specific sequence: right atrium → right ventricle → lungs → left atrium → left ventricle → body.

• Coronary Circulation: Supplies the heart muscle (myocardium) with oxygenated blood via coronary arteries.

• Cardiac Cycle: The sequence of events in one heartbeat, including systole (contraction) and diastole (relaxation).

• Electrocardiography (ECG): Measures the electrical activity of the heart, useful for diagnosing arrhythmias and other cardiac conditions.

• Hemodynamics: The study of blood flow and the forces involved, including blood pressure and resistance.

Example: The P wave on an ECG represents atrial depolarization.

Chapter 18: Blood Vessels

Structure and Function of Blood Vessels

Blood vessels form a closed circuit of tubes that carry blood throughout the body. They are classified based on structure and function.

• Arteries: Carry blood away from the heart; have thick, elastic walls to withstand high pressure.

• Veins: Return blood to the heart; have thinner walls and valves to prevent backflow.

• Capillaries: Microscopic vessels where exchange of gases, nutrients, and wastes occurs between blood and tissues.

• Hemodynamics: Includes concepts such as blood pressure, resistance, and flow rate.

• Regulation: Blood vessel diameter is regulated by the autonomic nervous system and local factors.

Example: Vasoconstriction increases blood pressure by narrowing blood vessels.

Chapter 19: Blood

Composition and Function of Blood

Blood is a connective tissue composed of plasma and formed elements. It performs vital functions such as transport, regulation, and protection.

• Plasma: The liquid component, containing water, proteins (albumin, globulins, fibrinogen), nutrients, hormones, and waste products.

• Formed Elements: Red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).

• Hemostasis: The process of stopping bleeding, involving vascular spasm, platelet plug formation, and coagulation.

• Blood Types: Determined by the presence of specific antigens on red blood cells (e.g., ABO and Rh systems).

Example: Type O blood lacks A and B antigens and is considered the universal donor.

Chapter 20: The Lymphatic System and Immunity

Structure and Function of the Lymphatic System

The lymphatic system returns excess tissue fluid to the bloodstream and plays a key role in immune defense.

• Lymphatic Vessels: Transport lymph (fluid) from tissues to the circulatory system.

• Lymph Nodes: Filter lymph and house lymphocytes that respond to pathogens.

• Organs: Includes the spleen, thymus, and tonsils.

• Immunity: The body's defense against pathogens, including innate (nonspecific) and adaptive (specific) immunity.

• Cellular Components: B cells (produce antibodies), T cells (cell-mediated immunity), and other immune cells.

Example: The spleen filters blood and removes old or damaged red blood cells.

Chapter 21: The Respiratory System

Structure and Function of the Respiratory System

The respiratory system is responsible for gas exchange, supplying oxygen to the blood and removing carbon dioxide.

• Major Organs: Nose, pharynx, larynx, trachea, bronchi, lungs, and alveoli.

• Mechanics of Breathing: Involves inspiration (inhalation) and expiration (exhalation), driven by changes in thoracic volume and pressure.

• Respiratory Volumes and Capacities: Includes tidal volume, vital capacity, and residual volume.

• Control of Respiration: Regulated by respiratory centers in the brainstem and chemoreceptors sensitive to CO2, O2, and pH.

Example: During exercise, increased CO2 levels stimulate faster breathing.

Chapter 22: The Digestive System

Structure and Function of the Digestive System

The digestive system breaks down food into nutrients that can be absorbed and used by the body.

• Major Organs: Mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus.

• Accessory Organs: Salivary glands, liver, gallbladder, and pancreas.

• Digestive Processes: Ingestion, propulsion, mechanical digestion, chemical digestion, absorption, and defecation.

• Absorption: Most nutrients are absorbed in the small intestine; water and electrolytes are absorbed in the large intestine.

Example: The liver produces bile, which aids in the digestion and absorption of fats.

Chapter 23: Metabolism and Nutrition

Overview of Metabolism and Nutrition

Metabolism encompasses all chemical reactions in the body, including those that break down nutrients for energy and those that build new molecules.

• Catabolism: The breakdown of complex molecules into simpler ones, releasing energy (e.g., glycolysis, cellular respiration).

• Anabolism: The synthesis of complex molecules from simpler ones, requiring energy (e.g., protein synthesis).

• Nutrient Absorption: The process by which digested nutrients enter the bloodstream from the digestive tract.

• Post-Absorptive State: The period when the digestive tract is empty and energy needs are met by stored nutrients.

Example: Glucose is stored as glycogen in the liver and muscles during the absorptive state.

Chapter 24: The Urinary System

Structure and Function of the Urinary System

The urinary system removes waste products from the blood and regulates fluid, electrolyte, and acid-base balance.

• Major Organs: Kidneys, ureters, urinary bladder, and urethra.

• Nephron: The functional unit of the kidney, responsible for filtering blood and forming urine.

• Filtration: Occurs in the glomerulus; filtrate passes through the nephron where reabsorption and secretion modify its composition.

• Glomerular Filtration Rate (GFR): The rate at which blood is filtered in the kidneys; regulated by blood pressure and other factors.

Example: Antidiuretic hormone (ADH) increases water reabsorption in the kidneys, reducing urine output.

Chapter 25: The Reproductive System and Basic Homeostasis

Structure and Function of the Reproductive System

The reproductive system is responsible for producing gametes, enabling fertilization, and supporting the development of offspring.

• Male Reproductive System: Includes testes (produce sperm), ducts, accessory glands, and penis.

• Female Reproductive System: Includes ovaries (produce eggs), uterine tubes, uterus, and vagina.

• Hormonal Regulation: Involves hormones such as testosterone, estrogen, and progesterone.

• Basic Events: Spermatogenesis (sperm production), oogenesis (egg production), fertilization, and menstrual cycle.

Example: The menstrual cycle is regulated by fluctuating levels of estrogen and progesterone.

Key Table: Comparison of Blood Vessels

The following table summarizes the main differences between arteries, veins, and capillaries:

Type	Wall Thickness	Valves	Function
Arteries	Thick	No	Carry blood away from heart
Veins	Thin	Yes	Return blood to heart
Capillaries	Very thin (one cell layer)	No	Exchange of gases, nutrients, wastes

Key Equations

• Cardiac Output: $\text{Cardiac Output} = \text{Heart Rate} \times \text{Stroke Volume}$

• Blood Pressure: $\text{Blood Pressure} = \text{Cardiac Output} \times \text{Total Peripheral Resistance}$

• Glomerular Filtration Rate (GFR): $\text{GFR} = \text{K}_f \times [(\text{P}_\text{GC} - \text{P}_\text{BS}) - (\pi_\text{GC} - \pi_\text{BS})]$

Additional info: Some explanations and examples have been expanded for clarity and completeness based on standard Anatomy & Physiology curricula.