Which vessels empty blood into the left atrium?
A. Pulmonary trunk
B. Aorta
C. Pulmonary arteries
D. Pulmonary veins
E. Right atrium
Answer: D
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During _________ of the cell cycle, the chromatids are pulled to opposite sides of the cell.
Fill in the blank(s) with the appropriate word(s).
The salt level in the nephron is particularly high in comparison to its surrounding environment. Which of the following will most likely occur?
A) The salts will move from high to low concentration. B) The salts will move into the descending loop. C) Other dissolved substances will move into the nephron. D) The fluid in the nephron will move into the surrounding environment.
Answer the following statements true (T) or false (F)
1. Smooth, striated, and cardiac are examples of muscle tissues. 2. An important part of muscle tissue is the matrix found in between cells. 3. Both neurons and glia cells make up nervous tissue. 4. Areolar, blood, bone, and cartilage are all examples of connective tissue. 5. The human body consists of about 25 billion cells.
During the male climacteric,
A) sperm production ceases. B) the penis shrinks. C) FSH and LH levels rise. D) sexual activity increases. E) circulating testosterone levels increase.