An erection of the penis is caused by
A. semen pressure from the testes and ductus deferens.
B. muscle flexion of the penile muscles.
C. increased secretions of lymph into the spongy tissue.
D. blood filling the erectile bodies and compressing the veins.
E. ejaculatory muscles.
D
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Eversion and inversion refer to movements of the ____
a. hand
b. wrist
c. knee
d. foot
Salivary amylase digests proteins.
Answer the following statement true (T) or false (F)
Why it is critical that the peroxisome is a membrane-bounded organelle?
What will be an ideal response?
Which is true about the structure and function of a gene?
A. It is an uncoiled protein that contains information necessary for the synthesis of other proteins. B. It is a sequence of nucleotides in DNA that acts as an enzyme to digest proteins. C. It is composed of many molecules of DNA and contains information needed to make RNA. D. It is a sequence of nucleotides in DNA that contains information necessary for the synthesis of proteins.