pg 2 Flashcards
(11 cards)
What is the primary function of blood cells?
To carry oxygen, fight infection, produce lymphocytes, initiate blood clotting
Blood cells perform multiple functions including oxygen transport and immune response.
What two pressures are compared in tissue-blood exchange?
Blood pressure and osmotic pressure
These pressures influence the movement of molecules between blood and tissues.
What tends to happen at the arterial side of a capillary?
Water, oxygen, and glucose tend to leave the bloodstream
This occurs because blood pressure is higher than osmotic pressure.
What occurs at the venous end of a capillary?
Water, ammonia, and carbon dioxide tend to enter the capillary
At this end, osmotic pressure is higher than blood pressure.
Fill in the blank: The pressure of blood in blood vessels tends to push molecules _______.
out of the blood
This movement is primarily due to blood pressure.
True or False: Osmotic pressure varies considerably around a capillary bed.
False
Osmotic pressure is basically constant.
What is the effect of blood pressure on the movement of molecules?
It pushes molecules out of the blood
This is counteracted by osmotic pressure which pulls molecules in.
What is the net pressure out at the arterial end of the capillary?
Blood pressure is greater than osmotic pressure
This leads to the movement of fluid from blood to tissues.
What type of fluid tends to enter the capillaries at the venous end?
Water, ammonia, and carbon dioxide
This is facilitated by the higher osmotic pressure compared to blood pressure.
What happens to blood pressure as it travels from arteries to veins?
Blood pressure decreases
This gradual decrease affects fluid exchange in capillaries.
Fill in the blank: The osmotic return of fluid from the tissues to the blood occurs at the _______.
venous end of a capillary
This is where osmotic pressure becomes the dominant force.
