Also known as the human breathing system, responsible for taking in oxygen and expelling carbon dioxide
Parts of the respiratory system
Nose and mouth
Nasal cavity or nasal passageways
Pharynx
Larynx
Trachea
Lungs
Bronchi
Bronchioles
Alveoli
Inhalation
1. Oxygen enters the body
2. Ribs move out, chest space increases
3. Diaphragm muscle contracts, moves down
Exhalation
1. Carbon dioxide exits the body
2. Ribs move in, chest space decreases
3. Diaphragm muscle relaxes, moves up
Circulatory system
Also known as the cardiovascular system, the life support structure that nourishes cells and delivers materials in the body
Major parts of the circulatory system
Heart
Blood vessels (arteries, veins, capillaries)
Blood
The heart is a hollow muscle as big as your fist
Parts of the heart
Right atrium
Left atrium
Right ventricle
Left ventricle
Tricuspid valve
Bicuspid valve
Pulmonary valve
Aortic valve
Superior vena cava
Inferior vena cava
Pulmonary artery
Pulmonary vein
Aorta
Circulatory system function
Air enters lungs, goes to left side of heart, pumped through body, oxygen processed by cells, carbon dioxide returned to right side of heart, expelled through lungs
Types of circulation
Pulmonary circulation
Coronary circulation
Systemic circulation
The circulatory system circulates vital elements like oxygen and nutrients, and transports waste away from the body
