Respiratory System

This week was our first week back after Spring break. We had a lecture on the cardiocascular systestem and learned how it works and a lot of terms. The cardiovascular system consists of the heart and a closed network of blood vessells composed of arteries, capillaries, and veins.

For example the cardiovascular system is made up of several structures:

1. Heart
2. Atrioventricular Valves
3. Semilunar Valves
4. pericardium
5. Blood vessels
6. Arteries
7. Arterioles
8. Aorta
9. Veins
10. Venules
11. Venae Cavae
12. Capillaries 

The heart is located behind the sternum (breast bone) and between the lungs. The heart consists of two upper chambers: The right atrium and the left artium. As well as two lower chambers: the right ventricle and left ventricle. The upper chambers are used to recieve blood, and the lower chambers to pump blood.

There are three layers of the heart, the epicardium, which covers the heart, myocardium, the middle, thick, muscular layer, and endocardium, the inner layer of the heart.

Funtion:

• The heart pumps blood containing oxygen and nutrients to body tissues through the arteries.
• The exchange of gases, nutrients, and waste between the blood and body tissue takes place in the capillaries.
• The blood carying carbon dioxide and waste is carried from the tissues through veins to organs of excretion.