1) Venous return is impacted by all of the following except : breathing body mov

Question

1)

Venous return is impacted by all of the following except:

breathing

body movement, such as walking

vasoconstriction in veins

hemorrhage, a loss of blood volume

2)

Which of the following would not influence blood pressure?

tachycardia

hormones, such as atrial naturietic peptide and antidiuretic hormone

stretch receptors in the vessels close to the heart

autonomic nervous system

all of these could influence blood pressure

actually, all of these could have an effect on venous return

Explanation / Answer

1. Hemorrhage, loss of blood volume

During hemorrhage adjustment within venous system occured for maintaining venous return. The factors that enable venous system to compensate during hemorrhage are, changes in venous elastance and mobilization of unstressed blood volume in to stressed blood volume.

Facters influencing venous return are:

1. Breathing: during inspiration the intrathoracic pressure is negative and abdominal pressure is positive. This makes a pulling pressure of blood towards right atrium and increase venous return.

2. Body movement: normal locomotory activity promots venous return by the muscle pump mechanism

3. Vasoconstriction in veins increases venous return

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