graded contractions (i.e., they not all-BI-HOIT 2. Encircle the correct choice w
ID: 3479653 • Letter: G
Question
graded contractions (i.e., they not all-BI-HOIT 2. Encircle the correct choice within each pair of parentheses. [18 points] Exercise increases the activity of the ( sympathetic (parasympathetic) nervous system. The (decreased nacresedsecretion of acety lcholine , c rate and stroke volume. As a result, cardiac output ( decreases , increases ) through an ( extrinsic intrinsic ) mechanism. catecholamines) decreases, increases ) heart During exercise, the bulging of the contracting muscles against the ( atteries , capillaies , veins) pushes blood towards the heart. This ( decreases , increases ) end-diastolic volume, which automatically ( decreases , increase) stroke volume by altering the ( contractiliy , elasticity) As a result, cardiac output ( decreases , increases ) through an ( extrinsic , intrinsic) , elasticity ) of the heart muscle. mechanism. During exercise, the arterioles of the skeletal muscles ( constrict , dilate ) in response to (acetylcholine , catecholamines ). This is an example of ( extrinsic, intrinsic ) regulation. During exercise, the arterioles of the skeletal muscles ( constrict dilate in response to decreasing increasing ) carbon dioxide, nittic oxide, and temperature in the surrounding tissues. This is an example of ( extrinsic intrinsic) regulation.Explanation / Answer
Exercise increases the activity of the sympathetic nervous system. The increased secretion of catecholamines increases the heart rate and stroke volume.As a result, cardiac output increases through an extrinsic mechanism.
During exercise, the bulging of contracting muscles against the arteries which push the blood towards the heart. This decreases end-diastolic volume, which automatically increases stroke volume by altering the contractility of the heart muscle. As a result, cardiac output increases through an intrinsic mechanism.
During exercise, the arterioles of skeletal muscles constrict in response to catecholamines. This is an example of extrinsic regulation.
During exercise, the arterioles of skeletal muscles dilate in response to increasing carbon dioxide, nitric oxide and, the temperature in surrounding tissues. This is an example of intrinsic regulation.
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