Humans are able to distinguish several million shades of color because
A. humans have large retinas.
B. humans have binocular vision.
C. they have many different types of cone cells.
D. different proportions of cone cells respond to each wavelength of light.
E. humans have more cones than rods.
D
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Blood is pumped through the heart by which type of muscle?
A. Skeletal B. Smooth C. Cardiac D. Visceral
The ribs that have no attachment to the sternum are
A) true ribs. B) ribs 8-12 and are called false ribs. C) floating ribs. D) ribs 11 and 12. E) ribs 11 and 12 and are called floating ribs.
The serous membrane lining the inside of the fibrous pericardium is the:
A) visceral layer B) endocardium C) parietal layer D) synovial membrane
Hormones act through binding to their receptors. Which of following hormones only binds to a receptor located on the cell membrane?
A. thyroid hormone B. catecholamine C. estrogen D. progesterone E. vitamin D