Major Organs of the Human Torso: Identification and Functions

Lab #1: List Associated to Model

Overview

This study guide summarizes the major organs found in a human torso model, as commonly used in Anatomy & Physiology laboratory courses. Understanding the location and function of these organs is essential for foundational knowledge in human anatomy.

Organs of the Human Torso

Central Nervous System

• Brain: The control center of the nervous system, responsible for processing sensory information, regulating bodily functions, and enabling cognition, emotion, and memory.

• Spinal Cord: A long, thin bundle of nervous tissue that transmits signals between the brain and the rest of the body. It is essential for reflex actions and communication with peripheral nerves.

Respiratory System

• Lungs: Paired organs responsible for gas exchange, allowing oxygen to enter the blood and carbon dioxide to be expelled from the body.

Cardiovascular System

• Heart: A muscular organ that pumps blood throughout the body, supplying oxygen and nutrients while removing waste products.

Digestive System

• Stomach: A muscular sac that initiates the digestion of proteins and mixes food with gastric juices.

• Small Intestine: Composed of three sections:

  • Duodenum: The first section, where most chemical digestion occurs.

  • Jejunum: The middle section, primarily involved in nutrient absorption.

  • Ileum: The final section, which absorbs remaining nutrients and connects to the large intestine.

• Large Intestine: Responsible for water absorption and feces formation. Subdivided into:

  • Ascending Colon

  • Transverse Colon

  • Descending Colon

  • Sigmoid Colon

  • Cecum: The pouch at the beginning of the large intestine.

  • Vermiform Appendix: A small, tube-like structure attached to the cecum.

  • Rectum: The final section, leading to the anal canal.

  • Anal Canal: The terminal part of the digestive tract, through which feces are expelled.

• Liver: The largest internal organ, involved in metabolism, detoxification, and bile production.

• Gallbladder: Stores and concentrates bile produced by the liver, releasing it into the small intestine to aid in fat digestion.

Urinary System

• Urinary Bladder: A muscular sac that stores urine before it is excreted from the body.

Reproductive System

• Ovaries: Female reproductive organs that produce eggs (ova) and hormones such as estrogen and progesterone.

• Testis (Testes): Male reproductive organs that produce sperm and the hormone testosterone.

Summary Table: Major Organs and Their Functions

Organ	System	Main Function
Brain	Nervous	Control center for body functions and cognition
Spinal Cord	Nervous	Transmits neural signals between brain and body
Lungs	Respiratory	Gas exchange (O2 in, CO2 out)
Heart	Cardiovascular	Pumps blood throughout the body
Stomach	Digestive	Initiates protein digestion
Small Intestine (duodenum, jejunum, ileum)	Digestive	Digestion and absorption of nutrients
Large Intestine (colon, cecum, rectum, anal canal)	Digestive	Water absorption, feces formation
Liver	Digestive	Metabolism, detoxification, bile production
Gallbladder	Digestive	Bile storage and concentration
Urinary Bladder	Urinary	Stores urine
Ovaries	Reproductive (female)	Produce eggs and hormones
Testis	Reproductive (male)	Produce sperm and hormones

Additional info:

• This list is foundational for identifying organs in anatomical models and understanding their basic functions. In laboratory settings, students are often required to locate and describe these organs on a physical model.

• Further study should include the relationships between these organs and their roles in maintaining homeostasis.