Human Body Systems Overview

The skeletal system provides shape and support to the human body.

The skeletal system protects major organs.

The respiratory system provides oxygen to the muscular system.

The heart is part of the circulatory system.

The mouth and teeth are part of the digestive system.

The circulatory system transports blood.

The muscular system helps the body move.

The nervous system sends messages to the brain.

The stomach breaks down food using enzymes and acids, further preparing it for absorption.

The small intestine is the primary site of nutrient absorption. It's where digested food molecules enter the bloodstream.

Metabolic waste products include urea, a nitrogenous waste product from protein breakdown, and carbon dioxide, a waste product of cellular respiration.

The epidermis, or outer layer of skin, is NOT part of the excretory system. While it does release sweat, its primary function is protection.

Smooth muscle lines the stomach and other internal organs. It contracts involuntarily to help with digestion.

The skeletal and muscular systems work together to provide support, shape, and allow movement of the body.

The excretory system removes liquid waste products from the body, filtering and eliminating them.

Both the excretory system and the digestive system play a role in eliminating waste from the body.

The three types of muscles are skeletal (attached to bones), smooth (found in organs), and cardiac (found in the heart).

The esophagus squeezes and pushes food towards the stomach, not just gravity.

The reproductive system is responsible for producing offspring. In females, it produces eggs and nourishes a fetus, while in males, it produces and delivers sperm.

Red blood cells carry oxygen to muscle tissue, ensuring a constant supply for energy production.

The body's systems work together, not independently, to function properly and maintain overall health.