which is an anterior muscle

HESI A2

Anatomy HESI A2

1. Which is an anterior muscle of the thigh?

A. Gluteus maximus
B. Quadriceps femoris
C. Biceps femoris
D. Adductor magnus

Correct answer: B

Rationale: The correct answer is B: Quadriceps femoris. The quadriceps femoris is an anterior muscle located on the front of the thigh. It is composed of four muscles: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. These muscles play a crucial role in extending the knee and are essential for activities like walking, running, and jumping. Choices A, C, and D are incorrect because they are not anterior muscles of the thigh. Gluteus maximus is a muscle located in the buttocks, biceps femoris is a muscle of the posterior thigh, and adductor magnus is a muscle of the medial thigh.

2. What is the primary function of the liver?

A. Detoxifying harmful substances
B. Producing bile
C. Producing insulin
D. Storing glycogen

Correct answer: A

Rationale: The primary function of the liver is to detoxify harmful substances in the blood. While the liver also produces bile, which aids in digestion, stores glycogen for energy storage, and participates in metabolism, its main and essential function is detoxification. Producing insulin is mainly attributed to the pancreas, not the liver.

3. A 3-volt flashlight uses a bulb with 60-ohm resistance. What current flows through the flashlight?

A. o.05 amp
B. o.5 amp
C. 1.8 amp
D. 18 amp

Correct answer: A

Rationale: : Using Ohm's Law, I = V / R: I = 3 / 60 = 0.05 amp. So, the correct current is 0.05 amp.

4. Cobalt-60 has a half-life of 5 years. If you start with 20 g of cobalt-60, how much is left after 10 years?

A. 15 g
B. 10 g
C. 5 g
D. 2.5 g

Correct answer: C

Rationale: Cobalt-60's half-life of 5 years means that after 5 years, half of the initial amount remains. Therefore, after 10 years, a quarter (half of a half) of the initial amount will remain. Starting with 20 g, after 10 years, 5 g of cobalt-60 will be left. Choice A (15 g) is incorrect because it assumes a linear decrease, not considering the exponential decay characteristic of radioactive substances. Choice B (10 g) is incorrect as it overlooks that after 10 years, more decay has occurred. Choice D (2.5 g) is incorrect as it represents only an eighth of the initial amount after 10 years, not a quarter.

5. Select the word or phrase that makes the following sentence grammatically correct. After ___________ for an entire afternoon, the resident felt revitalized.

A. having rest
B. resting
C. rested
D. rest

Correct answer: B

Rationale: The correct answer is 'B - resting' because it is the present participle form of the verb 'rest' and fits appropriately in the sentence structure 'After resting for an entire afternoon, the resident felt revitalized.' The present participle is used to show an ongoing action that happened before the feeling of revitalization. Choice A 'having rest' is incorrect as it does not convey the continuous action needed in this context. Choice C 'rested' is incorrect as it is the past tense form and does not match the tense of the sentence. Choice D 'rest' is incorrect as it is the base form of the verb and does not provide the needed -ing form for the sentence.