Question

The left auricle opens into the left ventricle through an aperture that is guarded by
A. Tricuspid valve
B. Bicuspid valve
C. Mitral valve
D. Both B and C

Answer 1

Here, we will look at the various valves present in the heart to regulate the coordinated circulation of blood flow. The heart has four valves that allow blood to circulate properly. This includes the mitral, tricuspid, pulmonary and aortic valves. These are valves. Each valve has a flap or a cusp that opens and closes at any heartbeat once.

Complete answer:
Given, the blood flows from the left auricle into the left ventricle and this flow is guarded by a valve that we need to find out.
The left auricle receives less amount of oxygenated blood, thus to have a well-coordinated flow of blood and to prevent the backflow of the blood from the left ventricle to the left auricle a bi-flapped structure that is the bicuspid valve is present. So, Option B is correct
The tricuspid valve is the three flapped structure that regulates the control of blood flow from the right auricle into the right ventricle. Since, the right auricle receives more amount of deoxygenated blood, thus to have a well-coordinated flow of blood and to prevent the backflow of the blood from right ventricle to the right auricle a three flapped structure that is the tricuspid valve is present. After looking at the location, option A is not the correct answer.
The Mitral valve is the other name of the Bicuspid valve. So, the function and location of the mitral valve are also the same as the Bicuspid valve. Therefore, both Option B and C are correct and thus Option D that is Both B and C is the best-fit answer to this question.

Hence, option D is the correct answer.

Note:
A bicuspid valve is a bi-flapped structure that regulates the control of blood flow from the left auricle into the left ventricle. The Mitral valve is the other name of the Bicuspid valve. Here, the best method to solve these types of questions is to consider the eliminative approach. In this question also we first eliminated the tricuspid valve due to the different locations and later the remaining options were checked and all the options were correct so the best fit was chosen.