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Efferent Nervous Divisions Worksheet
Autonomic motor nervous division:
1.
Imagine you are in an acutely stressful situation such as when you encounter a bear during a hike in the woods.
What branch of the efferent peripheral nervous system contains the neurons that will increase activity to control
visceral organ system responses to this situation? (Circle your answer)
autonomic parasympathetic
2.
autonomic sympathetic
somatic motor
For each of the following responses of a target tissue, circle the correct word to explain what the effect will
be for an increase in sympathetic nervous system activation:
a.
adrenal medulla epinephrine secretion
increases
b.
eye pupils
constrict
or
dilate
c.
lung bronchioles constrict
or
dilate
d.
heart rate
increases
or
decreases
e.
insulin secretion increases
or
decreases
or
decreases
(* Can you do this for every organ listed in text Fig 11-4?)
3.
Draw a simple diagram to show the peripheral efferent neural pathway for the eye pupil response in this acutely
stressful situation of encountering a bear. For each synapse along the pathway, name the neurotransmitter
released and receptors for the neurotransmitter .
CNS Æ
4.
The digestive tract acts as an endocrine organ to secrete the hormones directly involved with digestion.
This activity is controlled separately from the control of blood vessels that supply blood to the digestive
tract. Name the nerve that contains parasympathetic neurons that project from the central nervous
system to control the secretory activities of the digestive tract.
5.
The following situation will illustrate how just the output of one branch of the autonomic nervous system can
control an organ. (You may find it helpful to review "Control of Signal Pathways" and "Homeostasis" sections in
Ch 6, particularly Figs 6-15, 6-16 and 6-17.) (3 pts each)
a.
Name the autonomic nervous system neurotransmitter that activates receptors on smooth muscle
around blood vessels (arterioles and veins) in the body:
b.
Name the types of receptors on smooth muscle around blood vessels (arterioles and veins) in the
body:
c.
When the sympathetic branch of the autonomic motor nervous system increases release of
neurotransmitter, which blood vessels will contract? (circle your answer below)
vessels to large leg muscles
d.
vessels to digestive organs
When the sympathetic branch of the autonomic motor nervous system increases release of
neurotransmitter, which blood vessels will dilate? (circle your answer below)
vessels to large leg muscles
vessels to digestive organs
e.
Based on your information stated above, which type of receptor is on the smooth muscle surrounding
blood vessels to the large leg muscles?
f.
Based on your information stated above, which type of receptor is on the smooth muscle surrounding
blood vessels to the digestive organs?
Somatic Motor nervous division:
6.
The autonomic motor division innervates glands, smooth and cardiac muscle, and fat tissue whereas
somatic motor nerves innervate __________________________.
7.
Somatic motor nerves are always stimulatory. They use the neurotransmitter _____________, to act on
_______________________ receptors.
8.
Activation by a somatic motor neuron always signals a muscle contraction. List the steps that occur in the
neuromuscular junction to stimulate the skeletal muscle.