Describe slow calcium channels and the significance of their activity
What will be an ideal response?
Slow calcium channels are voltage-gated calcium channels that open slowly and remain open for a relatively long period — about 175 msec. When they are open, the entry of calcium ions into the cell roughly balances the loss of sodium ions through the active transport of sodium ions. As a result, the membrane potential remains near 0 mV for an extended period.
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Which of the following processes allows cells to concentrate material that is present only in very small amounts in the extracellular fluid?
A)receptor-mediated endocytosis B)phagocytosis C)pinocytosis D)Transcytosis
Odorants must be volatile to be smelled
Indicate whether the statement is true or false
The term embryo is used:
a. after the first 8 weeks of pregnancy b. after the blastocyst has implanted in the uterine wall c. during the entire pregnancy d. from fertilization to the end of the eighth week of pregnancy
Baroreceptors detect changes in __________.
A. blood O2 levels B. stretch in arterial walls C. blood CO2 levels D. blood H+ levels