ATI TEAS 7
ATI TEAS Practice Test Science
1. Which hormone is released by the adrenal glands in response to stress?
- A. Insulin
- B. Cortisol
- C. Adrenaline
- D. Glucagon
Correct answer: C
Rationale: Adrenaline is the correct answer. It is released by the adrenal glands in response to stress to prepare the body for the 'fight or flight' response. Adrenaline increases heart rate, dilates airways, and mobilizes energy stores to help the body deal with the perceived threat. Insulin (Choice A) is produced by the pancreas to regulate blood sugar levels, not in response to stress. Cortisol (Choice B) is another hormone released by the adrenal glands in response to stress, but it primarily helps regulate metabolism and immune response. Glucagon (Choice D) is also produced by the pancreas to increase blood sugar levels when they are low, not by the adrenal glands in response to stress.
2. Which of the following glands produces growth hormone?
- A. Pituitary
- B. Thyroid
- C. Adrenal
- D. Pancreas
Correct answer: A
Rationale: The correct answer is A: Pituitary. The pituitary gland, also known as the master gland, produces growth hormone, which plays a crucial role in stimulating growth and cell reproduction. Choice B, the thyroid gland, primarily produces hormones that regulate metabolism, not growth hormone. Choice C, the adrenal glands, produce hormones like cortisol and adrenaline, but not growth hormone. Choice D, the pancreas, produces insulin and glucagon for regulating blood sugar levels, not growth hormone.
3. What type of tissue is found in the outermost layer of skin?
- A. Muscle tissue
- B. Connective tissue
- C. Epithelial tissue
- D. Nervous tissue
Correct answer: C
Rationale: The correct answer is C: Epithelial tissue. Epithelial tissue forms the outermost layer of the skin, providing protection against external factors. It serves as a barrier and helps in preventing water loss and entry of pathogens into the body. Choice A, Muscle tissue, is incorrect as muscle tissue is responsible for movement, not skin structure. Choice B, Connective tissue, is incorrect as it provides support and structure to the body but is not the main component of the outermost layer of the skin. Choice D, Nervous tissue, is incorrect as nervous tissue is responsible for transmitting signals within the body, not for the outermost layer of the skin.
4. Which of the following statements is true about Noble gases?
- A. They are non-reactive.
- B. They are highly reactive.
- C. They have 8 valence electrons.
- D. They have 7 valence electrons.
Correct answer: A
Rationale: The correct answer is A: Noble gases are non-reactive because they have a full valence shell with 8 electrons, making them stable and unlikely to form chemical bonds with other elements. Choice B is incorrect because Noble gases are known for their inertness and lack of reactivity. Choice C is incorrect because Noble gases have 8 valence electrons, which is a key characteristic that contributes to their stability. Choice D is incorrect because Noble gases have 8 valence electrons, not 7.
5. Which of the following statements regarding the working of the heart is not correct?
- A. The atria contract, and the valves open to allow blood into the ventricles.
- B. The heartbeat begins when the heart muscles relax, and blood flows into the atria.
- C. The valves close to stop blood from flowing backward.
- D. The ventricles contract, forcing blood to leave the heart.
Correct answer: B
Rationale: The correct answer is B because the heartbeat actually begins when the heart muscles relax, allowing the chambers to fill with blood. The contraction phase follows, which propels blood out of the heart. The other statements are accurate in describing the normal sequence of events in the heart's functioning: the atria contract to push blood into the ventricles, the valves close to prevent backflow of blood, and the ventricles contract to pump blood out of the heart.
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