Question

question 16
1 pts
normal infants will show the babinski reflex up to the age of ____ years.
1.5 - 2
5
1
3
question 17
1 pts
how does a dually innervated autonomic effector differ from a singly innervated autonomic
effector?
a dually innervated effector receives input from both sympathetic and parasympathetic pathways. a
singly innervated autonomic effector receives input from only the sympathetic division.
a dually innervated effector receives input from both sympathetic and parasympathetic pathways. a
singly innervated autonomic effector receives input from only the parasympathetic division.
a dually innervated effector utilizes both acetylcholine and norepinephrine as neurotransmitters. a
singly innervated autonomic effector utilizes only acetylcholine.
a dually innervated effector utilizes both acetylcholine and norepinephrine as neurotransmitters. a
singly innervated autonomic effector uses only norepinephrine.

Explanation:

Question 16

The Babinski reflex is a normal finding in infants. As the nervous system matures, this reflex disappears. Typically, normal infants show the Babinski reflex up to 1 - 2 years of age.

The autonomic nervous system has two divisions - sympathetic and parasympathetic. A dually innervated autonomic effector gets input from both these divisions. A singly innervated autonomic effector gets input from only one division (either sympathetic or parasympathetic). The other options about neurotransmitters (acetylcholine and norepinephrine) are not the key difference between dually and singly innervated effectors. The key difference is in the source of innervation (input from one or both autonomic divisions).

Answer:

1.5 - 2

Question 17