_____________ models are more consistent with the facts of body-weight regulation than are set-point models
Fill in the blank(s) with the appropriate word(s).
Settling-Point
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Which of the following statements regarding smooth muscle versus striated muscle is false?
A. Calcium for skeletal muscle contraction enters the cell from the sarcoplasmic reticulum and through voltage-gated calcium channels in the plasma membrane, whereas the calcium for smooth muscle contraction enters the cell from the sarcoplasmic reticulum only. B. Smooth muscle contraction is regulated by the binding of calcium to calmodulin, whereas skeletal muscle contraction is regulated by the troponin-tropomyosin system. C. Smooth muscle is activated by the autonomic nervous system, whereas skeletal muscle is activated by the somatic nervous system. D. Separate enzymes mediate the binding of myosin to actin through phosphorylation and dephosphorylation in smooth muscle, whereas the myosin heads of skeletal muscle function as enzymes themselves to hydrolyze ATP. E. Smooth muscle contracts longer and relaxes more slowly compared to skeletal muscle.
Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles-all changes that prepare you should you need to move rapidly. This type of change is an example of:
A. positive feedback control. B. open loop feedback. C. negative feedback control. D. feedforward regulation. E. a failure of homeostasis.
Choose the organism from the list below that best fits each of the following descriptions.
A. euglenozoans B. Chlamydomonas C. dinoflagellates D. stramenopiles E. diplomonads
The vegetal pole of a frog zygote differs from the animal pole in that _____
A) the vegetal pole has a higher concentration of yolk B) the blastomeres originate only in the vegetal pole C) the vegetal pole cells undergo mitosis, but not cytokinesis D) the polar bodies bud from this region