The "buffy" coat of the middle layer of a centrifuged blood sample is composed of
A. platelets.
B. erythrocytes.
C. erythrocytes and leukocytes.
D. platelets and leukocytes.
E. leukocytes.
Answer: D
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This figure shows a lateral view of the skull. Which number indicates the lambdoid suture?
A. 1 B. 2 C. 3 D. 4 E. The lambdoid suture is not shown on this figure.
What do all hormones have in common?
A. They are made from amino acids. B. They are all lipid-soluble. C. They use the second messenger mechanism to control the target cell. D. They bind to and interact with a receptor on or in the target cell. E. They are bound to transport molecules in the blood.
Damage to ependymal cells would most likely affect the
A) formation of myelin sheaths. B) formation of cerebrospinal fluid. C) formation of ganglia. D) repair of axons. E) transport of neurotransmitters within axons.
In jawed vertebrates, the large artery leading from the heart to the body is called the __________
Fill in the blank with the correct word.