what is the primary function of lymph nodes small 3079616

ATI TEAS 7

ATI TEAS 7 science review

1. What is the primary function of lymph nodes, small, bean-shaped structures found along lymphatic vessels?

A. To store excess lymph fluid
B. To produce red blood cells
C. To filter lymph and fight infection
D. To transport lymph to the heart

Correct answer: C

Rationale: Lymph nodes primarily function to filter lymph and fight infection. They contain immune cells that help to remove pathogens and foreign particles from the lymph fluid as it passes through the nodes. This process helps to activate the immune response and defend the body against infections. Choice A is incorrect as lymph nodes do not store excess lymph fluid; they filter lymph. Choice B is incorrect as the production of red blood cells primarily occurs in the bone marrow, not in lymph nodes. Choice D is incorrect as lymph nodes do not transport lymph to the heart; they filter and process lymph to remove impurities and activate the immune response.

2. What is the volume of a cube with a side length of 3 cm?

A. 9 cmÂ³
B. 27 cmÂ³
C. 18 cmÂ³
D. 12 cmÂ³

Correct answer: B

Rationale: To find the volume of a cube, you cube the length of one side. In this case, the side length is 3 cm, so the volume is calculated as 3 cm * 3 cm * 3 cm = 27 cmÂ³. Therefore, the correct answer is 27 cmÂ³. Choice A (9 cmÂ³), Choice C (18 cmÂ³), and Choice D (12 cmÂ³) are incorrect as they do not correctly calculate the volume of a cube with a side length of 3 cm.

3. From the passage, which of the following statements represents a logical conclusion about the author?

A. The author loves to attend theatrical productions
B. The author prefers musical comedies
C. The author also enjoys concerts and movies
D. The author finds theater seating comfortable

Correct answer: A

Rationale: The correct answer is A. The passage does not provide any information about the author's preference for musical comedies (choice B), enjoyment of concerts and movies (choice C), or comfort with theater seating (choice D). However, the passage does mention cicadas and their emergence, not providing any details that connect to the author's preferences. Therefore, the only logical conclusion that can be drawn about the author is that they love attending theatrical productions, as suggested by the deep love for attending theater productions.

4. What generates action potentials, the all-or-nothing electrical signals traveling along neurons?

A. Glucose
B. Sodium and potassium ions
C. Neurotransmitters
D. Myelin

Correct answer: B

Rationale: Action potentials, the all-or-nothing electrical signals traveling along neurons, are generated by the movement of sodium and potassium ions across the neuronal membrane. This movement creates changes in the membrane potential, leading to the propagation of the electrical signal along the neuron. Glucose is a source of energy for neurons but is not directly involved in generating action potentials. Neurotransmitters are involved in communication between neurons but do not directly generate action potentials. Myelin is a fatty substance that insulates and speeds up the conduction of action potentials but does not generate them.

5. Which of the following structures connects muscle to bone?

A. Ligaments
B. Tendons
C. Muscles
D. Bones

Correct answer: B

Rationale: Tendons are the correct answer as they are fibrous structures that connect muscle to bone, enabling the transmission of force during movement. Ligaments, on the contrary, connect bone to bone, aiding in joint stability. Muscles contract to generate force and facilitate movement, while bones provide structural support and protect internal organs.