Circulatory System

Question 1

Arteries
Veins
Capillaries

Answer 1

Arteries

• away from the heart
• mostly oxygenated blood except for pulmonary arteries
• higher pressure fluid; pressure gradient with forward momentum
• muscular walls to regulate flow that are elastic

Veins

• towards the heart
• mostly deoxygenated
• lower pressure then arteries; no pressure gradient, and moves by normal muscle movement (one direction movement with valves)
• not muscular or elastic

Capillaries

• site of nutrient/waste exchange
• lose a lot of high pressure because it is a very small area with so many capillaries
• draining mechanism

Question 2

Hydrostatic pressure

Answer 2

Pressure exerted by fluid

Arteries to capillaries have high hydrostatic pressure

Question 3

Oncotic pressure within capillaries

Answer 3

Not much fluid in the capillaries and leaves you with much more concentrated blood leaving the capillaries

Oncotic Pressure
High pressure exerted by proteins
And because of this new high concentration after the capillaries then fluid wants to come back in; you don’t gain it all back up and the excess fluid who doesn’t come back in gets picked up at the lymphatic system

Question 4

Lymphatic system

Answer 4

Structurally and functionally like veins
Brings excess fluid that came out at the capillaries to bring it back to the heart

Lymph nodes
- immune cell pockets