Baroreceptor Team Assignment

Names of participating teammates:

WATCH THE BLOOD PRESSURE REFLEX VIDEO (on Canvas in modules) TO COMPLETE THE ASSIGNMENT:

Predictions page: 15 pts

ASSUMPTIONS: (1) Baroreceptors are stretch receptors. They will fire more when stretched.

(2) One sensory/afferent neuron can synapse with more than one interneuron. To help think through the

complete baroreceptor pathway, fill in this table with increase, decrease, not change.

With this

stimulus...

BaroR firing rate

will…

Sympathetic output will... Parasympathetic output will...

LOW BP

HIGH BP

In the baroreceptor reflex, the sensory neuron from the baroreceptor synapses onto multiple interneurons in

the CNS. The interneurons in turn synapse onto the sympathetic and parasympathetic neurons leading from

the medullary cardiovascular control centers to the appropriate targets.

What is the target of parasympathetic output from the CVCC?

What are the targets of sympathetic output from the CVCC?

Fill in the blanks below with increase(s), decrease(s), or not change. You will use this information to help

correctly fill in the table below.

When blood pressure increases, the baroreceptor firing rate and the firing rate of

the afferent neuron that links the baroreceptor to the brain .

The appropriate response to this reflex is decrease in blood pressure. To accomplish this, sympathetic

output from the brain to cardiovascular targets should .

Does firing rate on the input side of the reflex match firing rate of the symp side? Circle: yes no

If the input signal increases in firing rate but the output signal decreases, does that indicate that the

interneuron that links input to output is excitatory or inhibitory?

Now fill in the table below to help figure out the role excitatory (EX) or inhibitory (IN) interneurons in the

reflex. Decide whether a pressure change will excite or suppress interneuron output, and what effect that

change will have on sympathetic or parasympathetic output. Predict the type of interneuron!

If the

stimulus

is...

BaroR firing rate

will ...

Desired

effect on

symp

output?

Interneuron to

symp should be

EX or IN?

Desired effect

on parasymp

output?

Interneuron to

parasymp

should be EX or

IN?

HIGH BP

LOW BP

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Names of participating teammates: WATCH THE BLOOD PRESSURE REFLEX VIDEO (on Canvas in modules) TO COMPLETE THE ASSIGNMENT:

Predictions page: 15 pts

ASSUMPTIONS: (1) Baroreceptors are stretch receptors. They will fire more when stretched. (2) One sensory/afferent neuron can synapse with more than one interneuron. To help think through the complete baroreceptor pathway, fill in this table with increase, decrease, not change. With this stimulus... BaroR firing rate will… Sympathetic output will... Parasympathetic output will... LOW BP HIGH BP In the baroreceptor reflex, the sensory neuron from the baroreceptor synapses onto multiple interneurons in the CNS. The interneurons in turn synapse onto the sympathetic and parasympathetic neurons leading from the medullary cardiovascular control centers to the appropriate targets. What is the target of parasympathetic output from the CVCC? What are the targets of sympathetic output from the CVCC? Fill in the blanks below with increase(s), decrease(s), or not change. You will use this information to help correctly fill in the table below. When blood pressure increases, the baroreceptor firing rate and the firing rate of the afferent neuron that links the baroreceptor to the brain. The appropriate response to this reflex is decrease in blood pressure. To accomplish this, sympathetic output from the brain to cardiovascular targets should. Does firing rate on the input side of the reflex match firing rate of the symp side? Circle: yes no If the input signal increases in firing rate but the output signal decreases, does that indicate that the interneuron that links input to output is excitatory or inhibitory? Now fill in the table below to help figure out the role excitatory (EX) or inhibitory (IN) interneurons in the reflex. Decide whether a pressure change will excite or suppress interneuron output, and what effect that change will have on sympathetic or parasympathetic output. Predict the type of interneuron! If the stimulus is... BaroR firing rate will ... Desired effect on symp output? Interneuron to symp should be EX or IN? Desired effect on parasymp output? Interneuron to parasymp should be EX or IN? HIGH BP LOW BP

Geoff and Orthostatic Hypotension

In the Blood Pressure reflex computer program, the subject (Geoff) has been in bed for a number of days. When he stands up, his blood pressure drops and he becomes dizzy. This phenomenon is called orthostatic hypotension. Draw a flow chart to explain what occurs when Geoff stands up and experiences orthostatic hypotension. Hint: Read about orthostatic hypotension in chapter 15; start your flowchart with blood pooling in lower limbs, and incorporate all the steps of the length-tension relationship, end with hypotension (low blood pressure). 10 pts
Based on the circuit created in the video, what best describes what happens to the firing rate with hypertension (when the green “Raise BP” button was pressure simulating high blood pressure)? Note: Hypertension means high blood pressure. (use arrows to show increase or decrease) Baroreceptors Parasympathetic neurons 10 pts Sensory neurons Sympathetic neurons Interneurons in cardiovascular control center (CVCC) What happens to firing rate when you click on the man lying down and he stands up? 5 pts
The CVCC is the key to the ability of the nervous system to change incoming firing rate of baroreceptors to the opposite firing rate in sympathetic. The CVCC is found in the of the brainstem. In the blood pressure reflex program, the CVCC has three regions. The input region receives the sensory information, the pressor region corresponds to control and the depressor region corresponds to control. 6 pts
The next couple of questions ask about the layout of the baroreceptor circuit. As depicted by the blood pressure reflex program, the inhibitory interneuron synapses directly on: 5 pts Another interneuron Sympathetic preganglionic neurons Sympathetic postganglionic neurons Parasympathetic preganglionic neurons Parasympathetic postganglionic neurons
List the very specific locations in which the sympathetic cell bodies are found. Your answer should include segments of the spinal cord and also horn of the spinal cord. Use Figures 11.5 and 9.6b for reference. 6 pts
The cardiac ganglion is found in the wall of the heart. In the blood pressure reflex program, this ganglion is called the ganglion. List two additional names for the nerve that extends from the CVCC to this ganglion. 6 pts

Baroreceptor Team Assignment, Assignments of Physiology

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