Clark received a vaccine to help protect him against the measles, but his childhood friend Nicole contracted the measles since she did not receive a vaccine. For each person, determine if active immunity or passive immunity is involved and explain why
Clark benefitted from the vaccine.
What will be an ideal response?
Both Clark and Nicole received active immunity through their contact with the measles virus. Active immunity may be received naturally through exposure to an antigen via infection or artificially via a vaccination. Active immunity results in the production of memory cells and large numbers of antibodies and is, therefore, relatively long-lasting, ranging from years to a lifetime. The benefit for Clark is he did not have to experience the disease to form immunological memory against it.
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Of the following, which is an elastic artery?
A) the subclavian B) the external carotid C) the brachial D) the femoral E) the ulnar
What two systems does the peripheral nervous system divide into?
What will be an ideal response?
Each of the following is an example of a nonmembranous organelle except
A) lysosomes. B) cilia. C) centrioles. D) ribosomes. E) cytoskeleton.
Osmotic activity across plasma membranes is closely related to
a. the distribution of proteins in the membrane b. ionic differences between the ECF and ICF c. differences in protein composition between the ECF and ICF d. both a and b e. both a and c