quiz 10
When a severely dehydrated patient is brought to the hospital, an IV of normal saline is started immediately. Distilled water is not used because
it would cause the patient's blood cells to swell and eventually burst
For each molecule of ATP consumed during active transport of sodium and potassium, there is an import of ____ ions and an export of ____ ions.
two K+; three Na+
Osmosis is a specific form of
diffusion
Osmosis
helps plant cells maintain turgor pressure
Active transport usually moves molecules
in a direction opposite to the one in which diffusion moves them
phagocytosis, pinocytosis, and receptor-mediated endocytosis all involve
invagination of the plasma membrane
Osmosis moves water from a region of _______ to a region of _______.
low concentration of dissolved materials; high concentration of dissolved materials
When placed in water, wilted plants lose their limpness because of
osmosis of water into the plant cells
The difference between osmosis and diffusion is that
osmosis refers specifically to the movement of water, whereas diffusion refers to the movement of any type of molecule
When placed in a hypertonic solution, animal cells
shrink
If a red blood cell is placed in an isotonic solution, it will
take up and release water at equal rates
The existence of a concentration gradient of glucose across a membrane means that
the glucose molecules are more crowded on one side of the membrane than on the other.
Which of the following statements about cholesterol molecules is true?
they alter the fluidity of the membrane