Females have all the eggs they will ever have by the age of ________.
A. 4 months in utero
B. 8 months
C. puberty
D. 13 years
Answer: A
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Answer the following questions true (T) or false (F)
1. During an erection, blood from the testicular arteries fills the vascular spaces of the corpus spongiosum of the penis. 2. The accessory sex glands that contribute fluids to semen are the bulbourethral gland, the prostate, and seminal vesicles. 3. During cold temperatures, the testes are pulled closer to the pelvic floor and the warmth of the body wall, and the scrotum becomes shorter and heavily wrinkled.
The outward projections from the central gray matter of the spinal cord, seen easily in microscopic spinal cord cross sections, are called
A) wings. B) horns. C) pyramids. D) fibers. E) tracts.
The release of intracellular materials by a vesicle at the cell surface is called
A) osmosis. B) active transport. C) exocytosis. D) endocytosis. E) an ion exchange pump.
Phospholipids make up most of the lipid part of the cell membrane. Since water exists on both the outside and inside of a cell, which of the following phospholipid arrangements makes the most sense?
A) a single layer of phospholipids with the polar heads facing outside the cell B) a single layer of phospholipids with the polar heads facing inside the cell C) two back-to-back phospholipid layers with the polar heads facing out on both sides D) two back-to-back phospholipid layers with the non-polar tails facing out on both sides