Anatomy HESI A2

Correct Answer: D

Rationale: The correct answer is D because the mitral valve separates the left atrium and left ventricle. Blood flows from the left atrium through the mitral valve into the left ventricle. The other choices are incorrect because the tricuspid valve separates the right atrium and right ventricle (choice B), the pulmonary valve separates the right ventricle and pulmonary artery, and the aortic valve separates the left ventricle and aorta.

Correct Answer: A

Rationale: The correct answer is A because a sagittal section divides the body into right and left regions along the sagittal plane, which runs from front to back, dividing the body into symmetrical halves. Choice B is incorrect as it refers to a transverse section dividing the body into upper and lower regions. Choice C is incorrect as it describes a frontal section dividing the body into front and back regions. Choice D is incorrect as it pertains to the division between the dorsal and ventral cavities, not the body as a whole.

Correct Answer: D

Rationale: The correct answer is D because the mitral valve separates the left atrium and left ventricle. Blood flows from the left atrium through the mitral valve into the left ventricle. The other choices are incorrect because the tricuspid valve separates the right atrium and right ventricle (choice B), the pulmonary valve separates the right ventricle and pulmonary artery, and the aortic valve separates the left ventricle and aorta.

Correct Answer: B

Rationale: The correct answer is B: Quadriceps femoris. The quadriceps femoris is an anterior muscle of the thigh responsible for extending the knee joint. It consists of four muscles: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. These muscles are located in the front of the thigh and play a crucial role in activities like walking, running, and jumping. The other choices are incorrect because: A: Gluteus maximus is a large muscle located in the buttocks, not the anterior thigh. C: Biceps femoris is a muscle located in the posterior thigh, not the anterior thigh. D: Adductor magnus is a muscle located on the inner thigh, not the anterior thigh.

Correct Answer: B

Rationale: The epidermis is classified as a tissue. Tissue is a group of cells that work together to perform a specific function. The epidermis is composed of multiple layers of cells that protect underlying tissues. It does not meet the criteria of being a single cell (choice A), an organ (choice C), or a system (choice D). It is not a single cell because it is made up of multiple layers of cells. It is not an organ because an organ is a collection of tissues working together. It is not a system because a system is a group of organs working together. Therefore, the correct classification for the epidermis is a tissue.