The Heart and Circulatory System: Lecture 4 Flashcards
What are the 2 roles of the circulatory system?
- Transportation
- Oxygen, Carbon dioxide
- hormones - Regulates temperature
What are the 3 things that the blood consists of?
- Plasma
- Buffy coat
- Red blood cells
What is the percentage of the plasma?
55%
What is the percentage of the buffy coat?
less than 1%
What is the percentage of the red blood cells?
45%
Where is the Hb found?
red blood cells
Where are the platelets and white blood cells found?
buffy coat
What are the 3 systems of the blood?
- Venous system
- Arterial system
- Pulmonary system
What is the pressure in the pulmonary system?
low pressure
What is the pressure in the arterial system?
high pressure
What is the pressure in the venous system?
low pressure
True or False
The arteries carry oxygenated blood
True, except for pulmonary arteries
True or False
The veins carry deoxygenated blood
True, except pulmonary vein
Why does the arterial system have a higher pressure?
the blood leaving the left ventricle has to pump oxygenated blood everywhere
Why does the venous system have a lower pressure?
- for clean gas exchange (at the capillaries)
- valves help get the blood back to the heart
What is the heart?
muscle
What is the interventricular septum?
muscular wall that divides ventricles and contains the bundle of hiss
Blood moves down pressure gradients, meaning the volume will do what when it contracts?
get smaller, Boyle law
True or False
Valves open passively
true
Which kinds of values are classified as AV valves?
valves that separate the atrium and the ventricles
Which kinds of values are classified as semilunar valves?
separates ventricles from arteries
Why are the right AV valves different from the left AV valves?
- The right AV valve is tricuspid
- The left AV valve is bicuspid
Why are the left ventricular pressures 4 times bigger than the right?
because it pumps blood to the body
True or False
The more cusps the weaker the valve
True
