The most abundant component of plasma is:
A) water. B) ions. C) gases. D) proteins.
Answer: A
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The chorionic villi
A) help prepare the mammary glands for milk production. B) are free endodermal tips that grow toward the wall of the blastocyst. C) bulge into the amniotic cavity at the head fold and extend toward the trophoblast. D) provide the surface area for gaseous exchange between fetal and maternal bloodstreams. E) form constrictions that narrow the yolk stalk and the body stalk between the embryo and the surrounding trophoblast.
The lens of the eye flattens when
A. extrinsic eye muscles relax. B. ciliary muscles relax. C. ciliary muscles contract. D. intrinsic muscles of the iris contract. E. extrinsic eye muscles contract.
Articular cartilage is
A) found only in the knees and elbows. B) fibrocartilage. C) hyaline cartilage. D) elastic cartilage.
Answer the following statements true (T) or false (F)
1. T lymphocytes mature in the thymus. 2. The thymus reaches its largest functional size in mid-adulthood. 3. The tonsils located near the base of the tongue are called the palatine tonsils. 4. The tonsils located on either side of the throat are called the lingual tonsils. 5. The pharyngeal tonsils are also known as the adenoids.