The pleura is a connective tissue sheath that covers which of the following organs?

A. Lung

B. Heart

C. Spleen

D. Liver

Answer Explanation:

The pleura is a thin membrane that surrounds the lungs and lines the chest cavity. It protects the lungs from friction and infection, and helps them expand and contract during breathing. The other organs listed are not covered by the pleura, but by other types of connective tissue sheaths, such as the pericardium for the heart, the peritoneum for the spleen and liver, and the mesentery for the intestines.

Therefore, the Correct Answer is A.

Q #1: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

A. Lysozymes

B. Perforin

C. Cytokines

D. Granzymes

Answer Explanation

Cytokines are small proteins that act as chemical messengers between different types of immune cells. They can stimulate or inhibit the activation, proliferation, differentiation, and migration of immune cells. For example, interleukins are a type of cytokine that is produced by one type of white blood cell and can affect the behavior of another type of white blood cell. Lysozymes, perforin, and granzymes are all molecules that are involved in killing pathogens or infected cells, but they do not directly activate other immune cells.
Q #2: The measurement indicated by the line across the center of the cell is best referred to as which of the following?

A. Diameter

B. Volume

C. Area

D. Radius

Answer Explanation

One way to assess the size of a cell is to measure its diameter, which is the length of a straight line that passes through the center of the cell and touches both sides. The measurement indicated by the line across the center of the cell in the diagram is best referred to as the diameter of the cell.
Q #3: Which of the following glands synthesizes antidiuretic hormone?

A. Pancreas

B. Pineal gland

C. Hypothalamus

D. Thymus

Answer Explanation

Antidiuretic hormone (ADH) is a peptide hormone that regulates the water balance in the body by increasing the reabsorption of water by the kidneys. ADH is synthesized by the hypothalamus, a part of the brain that controls many functions, such as appetite, sleep, and body temperature. ADH is then stored and released by the posterior pituitary gland, which is located at the base of the brain.

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The pleura is a connective tissue sheath that covers which of the following organs?

More Questions on TEAS 7 Science

Q #1: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

Answer Explanation

Q #2: The measurement indicated by the line across the center of the cell is best referred to as which of the following?

Answer Explanation

Q #3: Which of the following glands synthesizes antidiuretic hormone?

Answer Explanation

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