Helper T-lymphocyte activation involves MHC class I, whereas cytotoxic T-lymphocyte activation involves MHC class II.
Answer the following statement true (T) or false (F)
False
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A stem cell that can give rise to all tissues except the trophoblast cells of the placenta is called ________.
A. totipotent B. multipotent C. retropotent D. pluripotent
When body temperature decreases below the normal range, thermoreceptors in the skin and hypothalamus detect the decrease in body temperature. The heat-promoting center of the hypothalamus is activated, which sends signals to blood vessels and skeletal muscles. In response, blood vessels in the skin constrict and skeletal muscles shiver. Determine the part of this negative feedback loop that serves as the control center.
A) hypothalamus B) thermoreceptors C) blood vessels and skeletal muscles D) body temperature
The penis becomes erect due to action potentials from the ________ part of the nervous system.
A. parasympathetic B. sympathetic C. somatic D. autonomic
What is ATP?
A. A usable form of energy for the cell B. The waste product produced by cellular respiration C. A modified glucose molecule D. Adenosine diphosphate