The presence of abundant smooth endoplasmic reticulum in vertebrate liver cells is related to its function in
a. steroid hormone production.
b. enzyme secretion.
c. detoxification of harmful substances.
d. protein synthesis.
e. calcium storage.
C
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Cholecystokinin is a(n) _________ released by the _________
A. enzyme; stomach B. enzyme; small intestine C. enzyme; gallbladder D. hormone; small intestine E. hormone; gallbladder
When the ductus deferens fuses with the base of the seminal gland, it forms (the)
A) deferential duct. B) prostatic urethra. C) ejaculatory duct. D) seminiferous tubules. E) None of the answers are correct.
Which of the following is the correct sequence, from simplest to most complex, in the levels of structural organization of the human body?
A) chemical level, tissue level, cellular level, organ system level, organ level, organismal level B) chemical level, cellular level, tissue level, organ level, organ system level, organismal level C) cellular level, chemical level, tissue level, organ level, organ system level, organismal level D) cellular level, tissue level, chemical level, organ level, organ system level, organismal level
Where are the visual pigments located in the rods and cones?
-inside membrane discs stacked in the outer segment -inside a photosensitive nucleus -in mitochondria located in the outer segment -in the inner segment of photoreceptors -sandwiched in the cell membrane of the photoreceptors