In the absence of a nerve connection or electrical stimulation, can a muscle cell be made to contract in
a laboratory setting? What will be an ideal response?
Yes. The key event in causing a muscle to contract is increasing the cytoplasmic calcium levels, as
calcium is responsible for removing the tropomyosin from the binding sites on the actin. Thus, by
injecting calcium into the cells they could be made to contract.
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When sperm enter the epididymis, they ________
A) are mature B) are incapable of moving on their own C) are ready to fertilize an egg D) come from the vas deferens
food moves down the esphagus under the influence of gravity alone.
a. true b. false
After the mature follicle releases the egg, the remaining follicle cells form the ________
Fill in the blank(s) with correct word
Palivizumab is used to treat respiratory syncytial virus disease. This antiviral drug is a(n)
A) toxoid. B) monoclonal antibody. C) vaccine. D) immunosuppressive. E) nucleoside analog.