MCAT Biology Question — Blood Pressure | Next Step Test Prep MCAT Biology Question — Blood Pressure | Next Step Test Prep

Fields marked with an * are required

Schedule a Free Tutoring Consultation

A Next Step Academic Manager will contact you within 1 business day or call us now at 888-530-6398.

Contact us

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Save

Physiologic dead space is any region in the lungs where air is entering the alveoli, but no oxygen exchange is taking place because the alveolus is not adequately perfused with blood. If a person’s pulmonary arterioles have constricted so much that the lungs have a significant increase in physiologic dead space, the constriction would most directly result in increased blood pressure where?

A) Aorta

B) Vena cava

C) Left ventricle

D) Right ventricle

 

 

Explanation

A) Aorta

B) Vena cava

C) Left ventricle

D) Right ventricle

The blood flows from the right ventricle into the pulmonary arteries and then the pulmonary arterioles. Constriction in the pulmonary arterioles would create a “back up” of blood in the pulmonary arteries and the right ventricle, thus increasing pressure. More generally, we may note that any time there is a blockage in the circulatory system, the pressure behind the blockage increases, and the pressure downstream from the blockage decreases.

 

Want more practice?

Fields marked with an * are required

Sign up for our MCAT Question of the Day!

X