Anatomy & Physiology Cardiac #7


Which valve allows oxygen-poor blood to enter the right ventricle from the right atrium?


  1. Aortic
    • Rationale:

      The aortic valve is the last valve that blood passes through before it enters the aorta or main blood vessel of the body. This valve prevents blood from leaking back into the left ventricle after it has been ejected from the heart.

  2. Mitral
    • Rationale:

      The mitral valve is one of four valves in the cardiac muscle. This valve regulates blood flow from the upper left chamber of the heart (i.e., left atrium) into the lower left chamber of the heart (i.e., left ventricle).

  3. Tricuspid
    • Rationale:

      The tricuspid valve separates the right atrium from the right ventricle. Its function is to prevent blood from flowing back into the right atrium during contraction of the ventricle.

  4. Pulmonic
    • Rationale:

      The pulmonic valve normally acts like a one-way door from the heart’s right ventricle to the lungs. Blood flows from the right ventricle through the pulmonary valve to the pulmonary artery and then into the lungs, where it picks up oxygen to deliver to the body.


A heart valve is a one-way structure that allows blood to flow in only one direction through the heart.


Learning Outcomes

There are four valves in the human heart that determine the pathway of blood flow. The four valves are as follows: aortic, mitral, pulmonic, and tricuspid. The tricuspid valve allows oxygen-poor blood to flow from the right atrium to the right ventricle.

Test Taking Tip

Consider the function of each choice to determine the correct answer for this question.

Video Rationale