Question

as we grow older, the sympathetic nervous system gradually becomes less and less efficient, particularly in its ability to (1 ) blood vessels. when older people stand up quickly, they often become lightheaded or faint. the reason is that the sympathetic nervous system is not able to react quickly enough to (2 ) the pull of gravity by activating the vasoconstrictor fibers, and blood pools in the feet. this condition, (3 ) hypotension, is a type of low blood pressure resulting from changes in body position as described. orthostatic (4 ) can be prevented to some degree if the person changes position slowly, giving the (5 ) nervous system time to adjust 1. hypotension 2. sympathetic 3. constrict 4 counteract 5 orthostatic 1. counteract 2. orthostatic 3. hypotension 4. sympathetic 5. constrict 1. constrict 2. counteract 3. orthostatic 4. hypotension 5. sympathetic 1 orthostatic 2 hypotension 3. sympathetic 4. constrict 5 counteract 1 sympathetic 2 constrict 3 counteract 4. orthostatic 5. hypotension

Explanation:

1. The sympathetic nervous system affects blood vessels. "Constrict" (to narrow) is a function related to blood vessels.
2. To deal with the pull of gravity, "counteract" (oppose) makes sense.
3. The condition is named "orthostatic" as it relates to position - change (ortho - position, static - related).
4. "Hypotension" is low blood pressure.
5. The nervous system involved is the "sympathetic" nervous system.

Answer:

1. constrict 2. counteract 3. orthostatic 4. hypotension 5. sympathetic