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Case 1 Study Questions and Answers

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The heart is the central unit that pumps blood into 2 circuits, the pulmonary and systemic circuits. Define cardiovascular function sends deoxygenated blood to the lungs for removal of co2 and reoxygenates the blood Define the pulmonary circuit carries oxygenated blood through the aorta and aro...

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  • February 1, 2023
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  • 2022/2023
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Case 1 Study Questions and Answers


The heart is the central unit that pumps blood into 2 circuits, the pulmonary and systemic circuits.

Define cardiovascular function

sends deoxygenated blood to the lungs for removal of co2 and reoxygenates the blood

Define the pulmonary circuit

carries oxygenated blood through the aorta and around the body to supply oxygen to all our organs and tissues

Define the systemic circuit

True

True or false? The heart acts as a 2 sided pump, the right side pumping blood to the lungs and the left side pumping
blood to the body.

The heart is innovated by the autonomic nervous system

What is the neuronal control of the heart?

Via the sympathetic and parasympathetic systems

How is the heart extrinsically innervated?

Sympathetic nerves innervate all of the heart, the pacemakers and the cardiac muscle

Speed up heart rate and force of contraction

Acts at the cardio acceleratory centre in the medulla

What is the role of the sympathetic nervous system in heart innervation?

Parasympathetic nerves only innervate the pacemakers

Acts at the cardioinhibitory centre in the medulla

Relaxes down heart rate and force of contraction

What is the role of the parasympathetic nervous system in heart innervation?

To T1 to T5 in the spinal cord chain

Where is sympathetic innervation of the heart on the spinal cord?



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, Preganglionic to spinal cord chain

Where is the preganglionic nerve going on the sympathetic side of the heart?

Postganglionic to heart

Where is the postganglionic nerve going on the sympathetic side of the heart?

False. It is the dorsal vagus nucleus involved

True or false? The ventral vagal nucleus is involved in parasympathetic innervation of the heart.

vagus nerve

What is the parasympathetic nerve innervating the heart?

Sympathetic nerves innervates all regions of the heart and parasympathetic nerves innervates SA and AV nodal
cells

What is the difference between sympathetic and parasympathetic innervation of the heart?

NA

What molecule is involved in producing a sympathetic contraction?

Ach

What molecule is involved in producing a parasympathetic contraction?

NA increases calcium and sodium permeability

NA stimulates beta-adrenoreceptors

What is the role of NA in producing a contraction? What receptor does it stimulate?

Ach hyperpolarises cells and decreases heart rate

Ach stimulates muscarinic receptors on pacemaker cells

What is the role of NA in producing a contraction? What receptor does it stimulate?

To increase AP in SA node and contraction force

What is the direct action of sympathetic nerves?

Rate

What is the direct action of parasympathetic nerves?

A = veins

B = arteries



This study source was downloaded by 100000857300661 from CourseHero.com on 12-11-2022 04:06:53 GMT -06:00


https://www.coursehero.com/file/181573590/Case-1-Study-Questions-and-Answerspdf/

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