Q:

In an adult subject standing quietly at rest, venous pressure in the

safaTerkawi
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2022-08-07
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 In an adult subject standing quietly at rest, venous pressure in the.

  1. Foot is approximately equal to arterial pressure at heart level.
  2. Thorax decreases when the subject inhales.
  3. Hand is subatmospheric when the hand is raised above the head.
  4. Venous sinuses of the skull are subatmospheric.
  5. Superior vena cava is an index of cardiac filling pressure.
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safaTerkawi
2022-08-07
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A. True  It is about 90 mmHg, due to the column of blood (about 1 metre) between the heart and the foot.

B. True  The negative intrathoracic pressure during inhalation is transmitted to the veins.

C. False  Limb veins collapse above heart level. Negative pressure cannot be transmitted along a collapsed tube so venous pressure is atmospheric in the raised hand.

D. True   The sinuses are held open by their meningeal attachments and cannot collapse.

E. True   A central venous pressure line is usually placed here.

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