ATI TEAS 7
Biology
1. What is the main component of sweat?
- A. Urea
- B. Glucose
- C. Water
- D. Electrolytes
Correct answer: C
Rationale: Rationale: - Sweat is primarily composed of water, making up the majority of its content. Water helps regulate body temperature by evaporating from the skin's surface, which cools the body down. - While sweat does contain small amounts of other substances like urea, glucose, and electrolytes, water is the main component that is secreted by sweat glands to help regulate body temperature during physical activity or in response to heat.
2. What is the term for the distance between the center of a lens or curved mirror and its focal point?
- A. Aperture
- B. Focal length
- C. Refractive index
- D. Lens thickness
Correct answer:
Rationale: The focal length of a lens or curved mirror is the distance between its center and the focal point, where parallel light rays converge or appear to diverge from.
3. The primary function of the atrioventricular (AV) node within the heart is to:
- A. Generate the electrical impulse for contraction (pacemaker function)
- B. Transmit the electrical impulse from atria to ventricles, regulating the timing of contraction.
- C. Increase blood pressure within the ventricles during systole.
- D. Separate oxygenated and deoxygenated blood flow in the heart.
Correct answer: B
Rationale: The correct answer is B: "Transmit the electrical impulse from atria to ventricles, regulating the timing of contraction." The AV node acts as a gateway between the atria and ventricles, ensuring a coordinated and sequential contraction of the heart chambers. It delays the conduction of electrical impulses to allow the atria to fully contract before the ventricles contract, facilitating efficient blood pumping. Options A, C, and D are incorrect because the primary role of the AV node is not to generate electrical impulses, increase blood pressure, or separate blood flow based on oxygenation status. Understanding the AV node's function is crucial in comprehending the heart's electrical conduction system.
4. Why are isotopes of the same element chemically similar?
- A. They have the same number of protons.
- B. They have the same number of electrons.
- C. Their chemical properties are identical.
- D. They share the same electron configuration.
Correct answer: A
Rationale: They have the same number of protons. This determines the element's identity and its interactions with other elements, leading to similar chemical behavior, even if the number of neutrons differs.
5. Which structure in the respiratory system serves as the "windpipe" that conducts air from the larynx to the bronchi?
- A. Trachea
- B. Larynx
- C. Bronchi
- D. Alveoli
Correct answer: A
Rationale: The correct answer is A: Trachea. The trachea, also known as the windpipe, is a tube-like structure in the respiratory system that connects the larynx to the bronchi. It serves as the main airway for the passage of air into and out of the lungs. The larynx is commonly known as the voice box and is responsible for producing sound. The bronchi are the two branches that stem from the trachea and lead to the lungs, where they further divide into smaller airways. The alveoli are tiny air sacs in the lungs where gas exchange occurs. Therefore, the trachea is the correct answer as it directly conducts air from the larynx to the bronchi.
6. What is the meaning of the idiom "to bite off more than one can chew"?
- A. To be overly confident
- B. To take on more than one can handle
- C. To be easily discouraged
- D. To be meticulous in planning
Correct answer: B
Rationale: The idiom warns against undertaking a task exceeding one's capabilities.
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