Select the organs in which adrenaline is most likely to cause vasodilation by bi
ID: 3516195 • Letter: S
Question
Select the organs in which adrenaline is most likely to cause vasodilation by binding to Beta-2 Adrenergic Receptors. Select all that apply.
A.
Liver
B.
Myocardium
C.
Lungs
D.
Skeletal muscle
E.
Kidneys
Question 29
Which is true concerning the partial pressure for oxygen (PO2)?
A.
Is highest in systemic arteries
B.
Is reduced by half in the heart
C.
Is lowest in the lungs after inspiration
D.
Is lowest in the tissues
E.
None of the above are true
Question 30
Which of the following is not a reason stroke volume increases with acute exercise or exercise training?
A.
Increase preload (EDV)
B.
Increase plasma volume
C.
Increase venous return
D.
Increase muscle blood flow
E.
Increase afterload or peripheral resistance
Question 31
Improvements in VO2max within the first week of training can be mostly attributed to an increase in...
A.
a-v O2 difference.
B.
mitochondrial density.
C.
heart rate.
D.
plasma volume.
Question 38
Which of the following statements is NOT TRUE regarding the oxygen-hemoglobin dissociation curve?
The curve shifts to the right during exercise due to a decrease in pH.
The curve shifts to the right during exercise due to an increase in temperature.
The curve shifts to the left during exercise at altitude.
The steep portion of the curve represents a condition where small decreases in PO2 result in rapid offloading of O2 from hemoglobin, which occurs at the tissues.
The curve for oxygen-myoglobin dissociation looks different from this curve, because myoglobin’s affinity for O2 is greater than hemoglobin.
A.
Liver
B.
Myocardium
C.
Lungs
D.
Skeletal muscle
E.
Kidneys
Explanation / Answer
Ans 28..myocardiam and skeltal muscle and kidney
Adrenergic by acting on beta 2 receptors causes vaso dialtion in systemic circulation and vaso constriction in pulmonary circulation so lungs will have vasocivasoconstr.hepatic circu katuon doe not changes majorily with beta 2 receptors activity.myocardium will have coronary vessels dialtion.kidney will have dilation of renal arteries and afferent arterioles.skeltal muscle will also have vaso dialtion.
Ans 29...d
The partial pressure of O2 is lowest in tissues that is 45 mm of Hg
In systemic circulation it is 95 mm of Hg
In alveoli of lung it is 105 mm of Hg
Ans 30...e...
Incrrase after load or peripheral resistance
If there is increase peripheral resistance of after load there will be difficulty to pump out the blood from heart so the stroke volume will decrease.
Ans 31..b.. mitochondrial density
With increase in training the mitonchondrial density increases so the VO2 max also increases.mitochondria represent the aerobic activity.with exercise mitochondria increases so that aerobic activity can be increased and the person will have less anerobic respiration.
Ans 38..ans c
The curve shift to.left during exercise at altitude statement is not true.it doesn't matter where u exercise.oxygen haemoglobin dissociation curve shift to right with excercie.a ll other options are correct
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