During the cardiac cycle, which heart valve prevents backflow of blood into the left atrium?
Tricuspid valve
Pulmonary valve
Mitral valve
Aortic valve
The Correct Answer is C
A. Tricuspid valve: The tricuspid valve is located on the right side of the heart. It prevents blood from flowing backward from the right ventricle into the right atrium during contraction (systole).
B. Pulmonary valve: The pulmonary valve is a semilunar valve located between the right ventricle and the pulmonary artery. It prevents blood from flowing back into the right ventricle after it has been pumped to the lungs.
C. Mitral valve: Also known as the bicuspid valve, this valve is located between the left atrium and the left ventricle. During ventricular contraction (systole), it closes tightly to prevent blood from regurgitating (flowing back) into the left atrium, ensuring blood exits through the aorta.
D. Aortic valve: The aortic valve is located between the left ventricle and the aorta. It prevents blood from flowing back into the left ventricle after it has been pumped out to the rest of the body.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Epithelial tissue:Epithelial tissue covers body surfaces and lines cavities. It is specialized for protection, secretion, and absorption, not electrical transmission.
B. Nervous tissue:Nervous tissue consists of neurons, which are highly specialized cells capable of generating and conducting electrical signals (action potentials) to communicate information throughout the body.
C. Muscle tissue:While muscle tissue is "excitable" and can conduct an electrical signal along its membrane to trigger contraction, its primary physiological specialization is contraction/movement, not the transmission of information.
D. Connective tissue:Connective tissue provides structural support, transport (blood), and energy storage (fat). It does not conduct electrical impulses.
Correct Answer is A
Explanation
A. Lens:The lens is a transparent, flexible structure located behind the iris. By changing its shape (accommodation), it fine-tunes the focus of light onto the retina to allow clear vision at various distances.
B. Pupil:The pupil is simply the opening (hole) in the center of the iris that allows light to enter the eye. It does not focus light itself.
C. Iris:The iris is the colored muscle that controls the size of the pupil, regulating the amount of light entering, but not the focus.
D. Cornea:The cornea is the clear outer layer that provides the initial and strongest refraction (bending) of light. However, the lensis the structure responsible for the variable focusing adjustment required to see clearly.
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