Week 13 notes Flashcards
Why are the walls of the arteries thicker than vein walls?
Because of the higher pressure of the blood that flows through them from the heart
What is vasoconstriction?
The lumen gets smaller
What is the lumen?
It is the space in the blood vessel where the blood flows
What is vasodilation?
The lumen gets smaller
What are the 3 differences between veins and arteries?
1) veins bring blood back to the heart, arteries carry blood away from the heart
2) veins have valves (act like doors) - because it is a low pressure system
3) arteries have lots of muscles in the walls - because it is a high pressure system
What is a venule? Does it have valves?
It’s a very small vein that collects blood from capillaries, no it doesn’t
Where is the best place to measure pulse
At the radial artery
What helps to carry blood back to the heart?
Skeletal muscles
What is the job of the superior vena cava?
It carries blood from the head, neck, arms and chest
What is the job of the inferior vena cava?
It carries blood from the legs, feet, and organs in the abdomen and pelvis
What is the job of the of the coronary sinus?
It’s a major coronary vein that drains deoxygenated blood from the heart muscle in the right atrium
What is the job of a jugular vein?
Collects blood from the skull, brain, superficial parts of the face, and the neck
What is the job of the carotid artery?
Carries blood to your head and neck, including your brain
What are the two pressures involved in capillary / lung exchange?
- Osmotic pressure drawing fluid back into the capillary
- Hydrostatic pressure, which is pressure that pushes fluid out of the capillary
What happens in artery capillary exchange?
Hydrostatic pressure is higher than osmotic pressure, fluid pushes out to tissues
