ATI TEAS 7
Science TEAS Practice Test
1. Which of the following is NOT a component of the genitourinary system?
- A. The kidneys
- B. The urethra
- C. The rectum
- D. The bladder
Correct answer: C
Rationale: The rectum is part of the digestive system, not the genitourinary system. The genitourinary system comprises organs involved in reproduction and urine formation and excretion, such as the kidneys, urethra, and bladder. Choices A, B, and D are all components of the genitourinary system. The kidneys filter blood and produce urine, the urethra is a tube that carries urine from the bladder out of the body, and the bladder stores urine before it is excreted.
2. Which of the following is responsible for transporting oxygen in the blood?
- A. White blood cells
- B. Red blood cells
- C. Platelets
- D. Plasma
Correct answer: B
Rationale: Red blood cells are responsible for transporting oxygen in the blood. Hemoglobin, a protein found in red blood cells, binds to oxygen in the lungs and carries it to tissues throughout the body. White blood cells are involved in the immune system's defense mechanisms against infections, platelets help in blood clotting, and plasma is the liquid component of blood that carries various substances like nutrients, hormones, and waste products.
3. What do nociceptors detect?
- A. Deep pressure
- B. Vibration
- C. Pain
- D. Temperature
Correct answer: C
Rationale: Nociceptors are specialized sensory receptors that detect and transmit signals related to pain. These receptors are activated by noxious stimuli that can potentially cause tissue damage or injury, triggering the perception of pain in the brain. Therefore, the correct answer is 'Pain.' Choices A, B, and D are incorrect because nociceptors specifically respond to painful stimuli, not deep pressure, vibration, or temperature.
4. What phenomenon is responsible for the mirage effect seen in deserts?
- A. Diffraction
- B. Refraction
- C. Interference
- D. Polarization
Correct answer: B
Rationale: Refraction is the bending of light as it passes from one medium to another of different density. In deserts, the temperature gradient causes light to bend, creating the mirage effect where distant objects appear distorted or displaced. Diffraction refers to the bending of light around obstacles or apertures, not the cause of mirages. Interference involves the superposition of two or more waves, which is not the mechanism behind mirages. Polarization refers to the orientation of light waves in a specific plane and is not responsible for the mirage effect in deserts. Therefore, the correct answer is refraction.
5. Which feedback loops are less common and sometimes harmful because they enhance stimuli rather than inhibit them?
- A. Negative feedback loop
- B. Positive feedback loop
- C. Inhibitory feedback loop
- D. Stimulating feedback loop
Correct answer: B
Rationale: Correct. Positive feedback loops enhance or amplify changes, which can sometimes be harmful as they drive processes further from equilibrium. In contrast, negative feedback loops work to counteract deviations from a set point, promoting stability. Choice A, 'Negative feedback loop,' is incorrect because negative feedback loops inhibit or reduce changes, promoting stability. Choice C, 'Inhibitory feedback loop,' is incorrect as it is synonymous with negative feedback loops. Choice D, 'Stimulating feedback loop,' is incorrect as it inaccurately describes the nature of positive feedback loops.
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