Neurotransmitters are
A) released from a nerve cell and diffuse across a synaptic gap to influence the target cells.
B) released from gap junctions directly into the cytoplasm of the connected cell.
C) chemicals released from certain cells that travel via the blood to target cells.
D) chemicals released by cells into the surrounding extracellular fluid and affect only other nearby cells.
E) electrical signals that move between adjacent cells.
A
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Most deserts occur near ____ latitude because of dry descending air masses
a. 0? b. 10? c. 20? d. 30? e. 40?
Elastic cartilage is found in
a. the ends of long bones. b. the outer flaps of the ears. c. intervertebral discs. d. the trachea. e. the ribs.
In DNA, the amount of adenine always equals the amount of thymine, and the amount of guanine always equals the amount of cytosine.
Answer the following statement true (T) or false (F)
Volumetric thirst is caused by (A)________, and is detected by (B)____________ in the kidney and heart.
a. (A) hypovolemia (B) high blood flow b. (A) hypovolemia (B) low blood flow c. (A) hypotonicity (B) high blood flow d. (A) hypertonicity (B) low blood flow