Unit 8 human body systems

Plasma

Liquid component of blood, carries nutrients.

Blood cells

Cells in blood, including red and white cells.

Platelets

Cell fragments that aid in blood clotting.

Arteries

Blood vessels carrying blood away from heart.

Veins

Blood vessels carrying blood towards the heart.

Diaphragm

Muscle controlling lung pressure for breathing.

Gas exchange

O2 and CO2 exchange in lungs and blood.

Epiglottis

Structure preventing food from entering lungs.

Chemical digestion

Food breakdown using enzymes in digestive tract.

Mechanical digestion

Food breakdown through movement, e.g., chewing.

Digestive system

System processing food from mouth to anus.

Small intestine

Site for digestion and nutrient absorption.

Large intestine

Absorbs water and forms waste.

Liver

Produces bile to emulsify fats.

Pancreas

Produces digestive enzymes and regulates blood sugar.

Homeostasis

Balanced internal environment maintained by body systems.

Lymphatic system

Collects fluid, filters lymph, and fights infection.

Spleen

Destroys old blood cells and platelets.

Thymus gland

Develops T cells for immune response.

Lymph nodes

Filter lymph fluid and trap bacteria.

Respiratory tract

Pathway air travels from nose to alveoli.