In general, the metabolism and excretion rates of steroid hormones are higher than those of peptide hormones
Indicate whether the statement is true or false.
FALSE
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__________ fluid prevents friction between the heart and the pericardium when the heart beats
Fill in the blank(s) with correct word
The plasma membrane
a. appears under an electron microscope as a double dark line with a light space between b. is composed primarily of a double layer of protein molecules with cholesterol molecules interspersed between them c. has a hydrophilic region between two hydrophobic regions d. has all of the above characteristics e. does not exhibit any of the above characteristics
African-American and white women are most similar in the percentage of those who have:
A. masturbated in the last year. B. performed oral sex. C. had two or more sexual partners in the last 12 months. D. had abortions.
The structures that connect cardiac muscle cells are
A. intercalated discs. B. motor end plates. C. neuromuscular junctions. D. intervertebral discs.