lymph nodes found along lymphatic vessels are important for

ATI TEAS 7

TEAS 7 practice test science

1. Lymph nodes, found along lymphatic vessels, are important for:

A. Storing blood
B. Producing antibodies
C. Filtering lymph and trapping harmful substances
D. All of the above

Correct answer: C

Rationale: Lymph nodes are essential for filtering lymph and trapping harmful substances. They are a vital part of the immune system as they remove pathogens and harmful substances from the lymph before it returns to the bloodstream. Lymph nodes do not store blood or produce antibodies, making choice C the correct answer. Choice A is incorrect because lymph nodes do not store blood; they primarily filter lymph. Choice B is incorrect as lymph nodes do not produce antibodies; that function is mainly carried out by specialized cells within the immune system. Choice D is incorrect as lymph nodes do not perform all the functions listed, making it an incorrect answer.

2. What is the purpose of an electrocardiogram?

A. Indicate the rate of blood flow
B. Display the heart's rate and rhythm
C. Identify a person's blood group type
D. Determine cell type in a blood sample

Correct answer: B

Rationale: An electrocardiogram (ECG or EKG) is used to measure and display the heart's rate and rhythm. It provides valuable information about the electrical activity of the heart, allowing healthcare providers to assess the heart's health, detect abnormalities in the heart's rhythm, and diagnose various cardiac conditions. Choices A, C, and D are incorrect. Choice A is incorrect because an ECG does not indicate the rate of blood flow but rather focuses on the heart's electrical activity. Choice C is incorrect because identifying a person's blood group type is typically done through blood typing tests, not ECG. Choice D is incorrect because determining cell type in a blood sample is unrelated to the purpose of an ECG.

3. What are the two main types of nuclear decay, and what differentiates them?

A. Fission and fusion, based on the size of the nucleus
B. Alpha and beta decay, based on the emitted particle
C. Spontaneous and induced decay, based on the trigger
D. Isotope decay and chain reactions, based on the stability of the nucleus

Correct answer: B

Rationale: The correct answer is B. The two main types of nuclear decay are alpha and beta decay, which are differentiated based on the emitted particle. In alpha decay, an alpha particle (consisting of two protons and two neutrons) is emitted from the nucleus, while in beta decay, a beta particle (either an electron or a positron) is emitted. These decay types are distinguished by the particles they emit, not by the size of the nucleus, trigger, or stability of the nucleus. Choices A, C, and D are incorrect because fission, fusion, spontaneous, induced, isotope decay, and chain reactions are different processes in nuclear physics and do not represent the two main types of nuclear decay based on emitted particles.

4. When ethanol (Câ‚‚Hâ‚…OH) reacts with sodium metal (Na), what is the product?

A. Ethene (Câ‚‚Hâ‚„)
B. Sodium ethoxide (Câ‚‚Hâ‚…ONa)
C. Ethane (Câ‚‚Hâ‚†)
D. Sodium acetate (CHâ‚ƒCOONa)

Correct answer: B

Rationale: When ethanol (Câ‚‚Hâ‚…OH) reacts with sodium metal (Na), the product formed is Sodium ethoxide (Câ‚‚Hâ‚…ONa). This reaction is a classic example of a metal displacing hydrogen in an alcohol to form an alkoxide. In this specific case, sodium replaces the hydrogen in ethanol, resulting in the formation of sodium ethoxide. Choice A, Ethene (Câ‚‚Hâ‚„), is incorrect as it is a different compound formed from the dehydration of ethanol, not its reaction with sodium. Choice C, Ethane (Câ‚‚Hâ‚†), is incorrect as it is a saturated hydrocarbon, not the product of the reaction of ethanol with sodium metal. Choice D, Sodium acetate (CHâ‚ƒCOONa), is incorrect as it involves acetic acid, not ethanol, reacting with sodium to form the salt sodium acetate.

5. What is the pathway of deoxygenated blood in our body?

A. From the lungs to the left ventricle
B. From the body to the right atrium, then to the right ventricle, and finally to the lungs
C. From the left atrium to the body
D. From the aorta to the right atrium

Correct answer: B

Rationale: The correct pathway of deoxygenated blood in our body involves blood returning from the body, entering the right atrium, then passing to the right ventricle, and eventually reaching the lungs for oxygenation. This sequence ensures that deoxygenated blood is pumped to the lungs, where it receives oxygen and releases carbon dioxide before circulating back to the body. Choices A, C, and D are incorrect because they do not follow the actual path of deoxygenated blood in the circulatory system.