How many blood vessels are in the umbilical cord?
a. 1
b. 2
c. 3
d. 4
Answer: c. 3
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Phospholipids
A. are found in plasma membranes. B. are used as an energy source by cells. C. are involved in the process of inflammation. D. can be modified to form cholesterol. E. are found inside organelles.
Once an SA nodal cell reaches threshold, the depolarization phase occurs during which
A. potassium moves out through fast voltage-gated channels. B. potassium comes in through fast voltage-gated channels. C. calcium comes in through fast voltage-gated channels. D. calcium moves out through slow voltage-gated channels. E. sodium moves out through slow voltage-gated channels.
The pH of the cerebrospinal fluid is monitored by which of these brainstem centers?
A) Medullary baroreceptors B) Hypothalamic osmoreceptors C) PRG D) Central chemoreceptors
ATP is consumed when ________ transfer solutes from one side of the membrane to the other
A) cell-identity markers B) channels C) cell-adhesion molecules D) pumps E) receptors