Circulatory System And Immunity Flashcards
What are the 5 functions of the Circulatory System?
1) Carries nutrients to cells, carries wastes away from cells
2) Carries chemical messengers(hormones) from cells in one part of the body to distant target tissues
3) Distributes heat throughout the body
4) Along with the kidneys, maintains levels of body fluids
5) Defense against invading organisms(white blood cells)
What is one difference between veins and arteries?
- veins contain one way valves, arteries do not
- veins are larger in diameter than arteries
- veins carry blood back to the heart
- arteries carry blood away from the heart
Pathway of blood through the heart
1) Superior/Inferior Vena Cava
2) Right atrium
3) tricuspid valve/av valve
4) right ventricle
5) semilunar valve
6) right/left pulmonary artery
LUNGS
7) pulmonary veins
8) left atrium
9) bicuspid/av valve
10) left ventricle
11) semi lunar valve
12) aorta
BODY
What are the Coronary Vessels?
Blood vessels that deliver
oxygen- rich blood to the heart muscles
Why is the left ventricle more muscular than the right ventricle?
It must work harder to pump blood to the entire body not just the lungs
Function of the Aorta
Carries oxygenated blood from the heart to the body
Function of the semilunar valve?
Prevent back flow of blood into the ventricles
One cardiac cycle =
One heartbeat
Each heartbeat has 2 phases
Systole = heart(ventricles) contract
Diastole = heart(ventricles) relaxes
What are the 2 numbers for blood pressure?
Systole and Diastole
Diastole
When the heart relaxes -
the atria fills with blood
Lubb =
Av valves closing
Dubb =
Semi lunar valves closing
Factors that increase blood pressure and decrease blood pressure
• alcohol • genetics • exercise(short term) ------- • loss of blood • less salt in the diet • eating right • exercise(long term)
Function of Helper T cells
Copy the antigen shape
