which structure in the lungs is the site of gas exchange

ATI TEAS 7

Practice TEAS Science Test

1. Which structure in the lungs is the site of gas exchange?

A. Trachea
B. Alveoli
C. Bronchioles
D. Diaphragm

Correct answer: B

Rationale: The correct answer is B: Alveoli. Alveoli are tiny air sacs in the lungs where gas exchange occurs. Oxygen from inhaled air diffuses into the bloodstream, while carbon dioxide from the blood is released into the alveoli to be exhaled. The trachea (Choice A) is the windpipe that carries air to and from the lungs, but it is not involved in gas exchange. Bronchioles (Choice C) are small air passages within the lungs that branch off from the bronchi, leading air to the alveoli but not directly involved in gas exchange. The diaphragm (Choice D) is a muscle below the lungs that helps in breathing by expanding and contracting the chest cavity, but it is not the site of gas exchange.

2. Which word is a synonym for 'brief'?

A. Short
B. Long
C. Detailed
D. Wordy

Correct answer: A

Rationale: 'Short' is the correct answer because it is a synonym for 'brief,' meaning concise or not lengthy. 'Long' (Choice B) is the opposite of 'brief.' 'Detailed' (Choice C) and 'Wordy' (Choice D) both imply a level of depth or excess information, making them incorrect choices.

3. Which of the following is an example of adaptive immunity?

A. Inflammation
B. Fever
C. Antibodies
D. Phagocytosis

Correct answer: C

Rationale: Antibodies are produced by the adaptive immune system in response to specific antigens. They play a crucial role in targeting and neutralizing pathogens, providing long-lasting immunity against future infections. In contrast, options A (inflammation), B (fever), and D (phagocytosis) are examples of innate immunity, the body's immediate, non-specific defense mechanisms. Inflammation is a response to tissue damage, fever is a systemic response to infection, and phagocytosis is a process where cells engulf and digest pathogens, all part of the innate immune response.

4. What is the relationship between the frequency and period of a wave?

A. They are unrelated
B. Frequency = Period
C. Frequency = 1/Period
D. Period = 1/Frequency

Correct answer: D

Rationale: The correct relationship between frequency and period of a wave is that Period = 1/Frequency. This relationship indicates that the period of a wave is the reciprocal of its frequency. Frequency refers to the number of complete cycles of a wave occurring in a unit of time, while the period is the time taken for one complete cycle of the wave to occur. As frequency and period are inversely related, the correct formula to express this relationship is Period = 1/Frequency. Choice A is incorrect as frequency and period are related. Choice B is incorrect as frequency and period are not equal. Choice C is incorrect as it suggests that frequency is directly proportional to period, which is not the case.

5. Hampton's greatest achievement as the leader of the BPP may be his fight against street gang violence in Chicago. Which of these, if any, is misspelled?

A. None of these are misspelled.
B. greatest
C. achievement
D. leader

Correct answer: A

Rationale: The correct answer is A. All the words in the sentence are spelled correctly, so there is no misspelling present. 'Greatest,' 'achievement,' and 'leader' are all spelled correctly. Choice B, 'greatest,' is correctly spelled as it refers to the highest rank or importance. Choice C, 'achievement,' is also spelled correctly, denoting something accomplished successfully. Choice D, 'leader,' is the correct spelling for a person who leads or commands a group.