Which of the following statements is false about the choroid plexus?
a. It is located within the ventricles of the brain.
b. It is composed of ependymal cells and blood capillaries.
c. It receives and filters all sensory information.
d. It produces and circulates cerebrospinal fluid.
c. It receives and filters all sensory information.
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The process whereby repeated exposure to a hormone can cause a decrease in the number of receptors for that hormone is called
A. down-regulation. B. saturation. C. antagonism. D. inhibition. E. competition.
Which of the following situations occurs in electrically excitable cells?
A. Depolarization causes voltage-gated sodium ion channels to open. B. Sodium ion channels are opened by high extracellular calcium levels. C. The sodium-potassium pump moves sodium into the cell. D. When Na+ ion channels open, K+ ion channels close. E. The opening and closing of ligand-gated channels cause depolarization.
Each intracellular protein exerts more osmotic effect than each intracellular phosphate ion because the proteins are larger
Indicate whether the statement is true or false
A class of rodenticides (commonly referred to as rat poison) work by antagonizing Vitamin K. If a child or animal ingests these rodenticides, would you expect to see normal clotting time, prolonged clotting time, or faster clotting time? Explain.
What will be an ideal response?