With reference to both the parasympathetic and sympathetic arms, comment on the autonomic nervous system activity...

With reference to both the parasympathetic and sympathetic arms, comment on the autonomic nervous system activity changes that allow heart rate to rise from approximately 60 bpm at rest to >150 bpm during strenous exercise.

Solutions

Expert Solution

Autonomic nervous system consists of sympathetic and parasympathetic nervous system.

During exercise, heart rate increases due to increased stimulation of sympathetic system and decreased stimulation of parasympathetic system.

Increased stimulation of sympathetic system causes -

1)stimulation of heart - which causes increase in rhythmicity of sino-atrial node leading to increase in heart rate.

2)stimulation of adrenal medulla - which releases epinephrine and nor-epinephrine into the blood.

These epinephrine and nor-epinephrine causes increase in myocardial contraction which leads to increase in heart rate and stroke volume.

Decreased stimulation of parasympathetic system causes- decrease in vagal activity.

Normally, increase in vagal activity causes decrease in heart rate due to decrease in rate of impulse generation by sino-atrial node.

So, decreased vagal activity causes increase in heart rate.

Sydney Mullin answered 10 months ago

Next > < Previous

Related Solutions

contrast the sympathetic and parasympathetic divisions of the autonomic nervous system and their effects

Distinguish between the sympathetic and the parasympathetic divisions of the autonomic nervous system. For each division,...

Distinguish between the sympathetic and the parasympathetic divisions of the autonomic nervous system. For each division, provide an example of a situation in which the division would become active. Describe the effects on several bodily processes of the activity of each division.

how are the parasympathetic and sympathetic divisions of the autonomic nervous system different? (pathways, cells, functions)...

how are the parasympathetic and sympathetic divisions of the autonomic nervous system different? (pathways, cells, functions) Please explain

1. Are the lungs innervated by both the sympathetic and parasympathetic nervous system? How about the...

1. Are the lungs innervated by both the sympathetic and parasympathetic nervous system? How about the eyes? And the heart?

Why does blocking the parasympathetic nervous system stimulates the sympathetic nervous system?

Explain sympathetic vs. parasympathetic nervous system and give examples.

Why would the sympathetic nervous system cause the release of glucagon, while the parasympathetic nervous system...

Why would the sympathetic nervous system cause the release of glucagon, while the parasympathetic nervous system cause the release of insulin?

Compare and contrast the sympathetic and parasympathetic nervous system from the perspective of their functions (two...

Compare and contrast the sympathetic and parasympathetic nervous system from the perspective of their functions (two examples) and anatomical basis. -include their anatomical origins in the CNS, the placement of ganglia, their neuronal composition including neurotransmitters and receptors used. -mass activation and its purpose and anatomical implications

1. Sympathetic chain assignment: Where in the brain is the origin (center) for autonomic nervous system?...

1. Sympathetic chain assignment: Where in the brain is the origin (center) for autonomic nervous system? What spinal levels do you find the preganglionic sympathetic neurons? What are the roots for greater splanchnic nerve? What are the 3 major pre-vertebral ganglia? What are the roots for the lesser splanchnic nerve? What are the roots for the least splanchnic nerve? 2. Abdominal aorta assignment: Which are the 3 major unpaired branches of the abdominal aorta? What are the 3 branches of...

12. Describe the sympathetic and parasympathetic nervous system. Include pre and postganglionic fibers with respect to...

12. Describe the sympathetic and parasympathetic nervous system. Include pre and postganglionic fibers with respect to target organs.

Subjects