LAB Chap 1 Organ Systems

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Organ Systems of the Human Body

Introduction

The human body is composed of multiple organ systems, each with specialized structures and functions that work together to maintain homeostasis and support life. Understanding these systems is fundamental in Anatomy & Physiology.

Overview of Organ Systems

Below is a summary of the major organ systems, their primary component organs, and their main functions.

Organ System	Major Component Organs	Function
Integumentary	Skin, hair, nails; cutaneous sense organs and glands	Protects deeper organs from mechanical, chemical, and bacterial injury, and from drying out Excretes salts and urea Aids in regulation of body temperature Produces vitamin D
Skeletal	Bones, cartilages, tendons, ligaments, joints	Body support and protection of internal organs Provides levers for muscular action Cavities provide a site for blood cell formation Bones store minerals
Muscular	Muscles attached to the skeleton	Primary function is to contract or shorten; skeletal muscles allow locomotion (running, walking, etc.), manipulation of the environment, and facial expression Generates heat
Nervous	Brain, spinal cord, nerves, sensory receptors	Allows body to detect changes in its internal and external environment and to respond by activating appropriate muscles or glands Helps maintain homeostasis of the body via rapid transmission of electrical signals
Endocrine	Pituitary, thymus, thyroid, parathyroid, adrenal, pineal glands; ovaries, testes, pancreas	Helps maintain body homeostasis, promotes growth and development Produces chemical messengers called hormones that travel in the blood to exert their effects on various target organs of the body
Cardiovascular	Heart and blood vessels	Primarily a transport system that carries blood containing oxygen, carbon dioxide, nutrients, wastes, ions, hormones, and other substances to and from tissue cells Antibodies and other protein molecules in the blood protect the body
Lymphatic/Immune	Lymphatic vessels, lymph nodes, spleen, thymus	Picks up fluid leaked from the blood vessels and returns it to the blood Cleanses blood of pathogens and other debris Houses lymphocytes that act via the immune response to protect the body from foreign substances
Respiratory	Nasal cavity, pharynx, larynx, trachea, bronchi, lungs	Keeps the blood continuously supplied with oxygen while removing carbon dioxide Contributes to the acid-base balance of the blood
Digestive	Oral cavity, pharynx, esophagus, stomach, small and large intestines, accessory structures (teeth, salivary glands, liver, pancreas)	Breaks down ingested foods to smaller particles, which can be absorbed into the blood for delivery to body cells Undigested residue removed from the body as feces
Urinary	Kidneys, ureters, bladder, urethra	Rids the body of nitrogen-containing wastes including urea, uric acid, and ammonia, which result from the breakdown of proteins and nucleic acids Maintains water, electrolyte, and acid-base balance of blood
Reproductive	Male: testes, prostate gland, scrotum, penis, duct system Female: ovaries, uterine tubes, uterus, mammary glands, vagina	Provides gametes called sperm for perpetuation of the species (male) Provides gametes called eggs; the female uterus houses the developing fetus until birth; mammary glands provide nutrition for the infant

Key Terms and Definitions

Homeostasis: The maintenance of a stable internal environment within the body.
Organ System: A group of organs that work together to perform one or more functions.
Hormone: A chemical messenger produced by endocrine glands, transported by the bloodstream to target organs.
Gamete: A reproductive cell (sperm in males, egg in females) that unites with another to form a new organism.

Examples and Applications

Example: The respiratory system supplies oxygen to the blood and removes carbon dioxide, which is essential for cellular respiration and energy production.
Application: Disorders in the cardiovascular system can lead to conditions such as hypertension, heart attack, or stroke, highlighting the importance of system integrity.

Short Comparison: Nervous vs. Endocrine System

Nervous System: Uses electrical impulses for rapid communication; effects are immediate but short-lived.
Endocrine System: Uses hormones for slower, longer-lasting communication; effects can persist for hours or days.

Relevant Equations

Acid-Base Balance (Respiratory & Urinary Systems):

This equation describes how carbon dioxide is converted to carbonic acid and then to bicarbonate and hydrogen ions, helping regulate blood pH.

Additional info:

Images referenced in the original material (e.g., rat dissection, superficial organs) are used for laboratory identification and practical understanding of organ systems.