1. Cardiovascular & Respiratory Systems
Chapter 4
Chapter 5.1

2. Cardiovascular/Circulatory System
Function – transports materials to and from your cell
Components
1. Blood
a. Four parts
* Red Blood Cells (RBCs)
-most abundant
- deliver O2 and remove CO2 using hemoglobin
* White Blood Cells (WBCs)
- destroy pathogens
* Platelets
- pieces of larger cells
- aid in forming blood clots
* Plasma
- fluid part of blood
- mixture of water, minerals

3. Blood Vessels
1. Arteries
a. direct blood away from the heart
b. Thick, elastic walls with a layer of smooth muscle
2. Capillaries
a. smallest vessel in the body
b. wall is only 1 cell thick
c. blood cells pass through single file
3. Veins
a. direct blood back to the heart
b. thinner walls than arteries
c. valves

4. Respiratory System
Respiration – process by which a body obtains and uses O2 and gets rid of CO2 and water.
2 Parts:
1. Breathing – inhaling/exhaling
2. Cellular respiration – chemical reactions that release energy from food
Respiratory System –
Nose – primary passageway into & out of system
Pharynx – common area known as the throat. Both food and air pass through
Larynx – voice box containing vocal cords. Air flows between vocal cords causing vibration and sound
Trachea – passageway for air traveling from the larynx to the lungs
Bronchi – trachea splits into 2 tubes; one to each lung
Lungs – bronchiole branches to form thousands of air sacs called alveoli. Capillaries surround the alveoli and gas exchange occurs here.

6. How do you breathe???
- your lungs do not contain muscle
- breathing is done with the muscle found in the ribs and diaphragm