chapter 19

Arterial pressure in the pulmonary circulation is much higher than in the systemic circulation because of its proximity to the heart.

• True

• False

Which will NOT occur if blood pressure drops below homeostatic levels?

•  

  Vasomotor center of the medulla will trigger vasoconstriction.

  
  

•  

  Cardiac output will increase.

  
  

•  

  Baroreceptors in the carotid sinuses and aortic arch will be stimulated.

  
  

•  

  The cardioacceleratory center of the medulla will be activated.

  
  

Which of the following best describes an example of autoregulatory vasodilation in a capillary bed?

• Constriction of blood flow during digestion

  
  

• Increase of blood flow in response to low oxygen levels

  
  

• Constriction of blood flow in response to fear

  
  

• Reduction of blood flow during exercise

  
  

The arterioles are under the highest pressure of all the vessels.

• True

• False

The carotid sinus reflex protects the blood supply to the brain, whereas the aortic reflex is more concerned with maintaining adequate blood pressure in the systemic circuit as a whole.

• True

• False

The inferior vena cava receives blood from which region of the body?

• Heart itself

  
  

• Head and neck

  
  

• Chest and arms

  
  

• Lower limbs and abdominal region

  
  

Blood is typically drawn from arteries.

•  

  True

  
  

• False

If a person were to have substantial blood loss, you would expect to see all of the following physiological events to happen EXCEPT one. Select the least likely response to substantial blood loss.

•  

  a weak, thread pulse

  
  

•  

  increasing vasomotor tone

  
  

•  

  increases peripheral resistance

  
  

•  

  decreased heart rate

  
  

Explain how venous valves assist blood flow:

• They control the heartbeat

  
  

• They increase blood pressure

  
  

• They prevent backflow of blood

  
  

• They decrease peripheral resistance

  
  

Which of the following is likely during vigorous exercise?

•  

  The skin will be cold and clammy.

  
  

•  

  Blood flow to the kidneys increases.

  
  

•  

  Blood will be diverted to the digestive organs.

  
  

•  

  Capillaries of the active muscles will be engorged with blood.