ATI TEAS 7
TEAS 7 science quizlet
1. Which term refers to the resistance of a liquid to flow?
- A. Density
- B. Viscosity
- C. Surface tension
- D. Boiling point
Correct answer: B
Rationale: Viscosity is the term that refers to the resistance of a liquid to flow. It is a measure of how thick or sticky a fluid is and determines how easily a liquid can flow. Density (A) is a measure of how much mass is contained in a given volume and is not related to the resistance of a liquid to flow. Surface tension (C) is the property of a liquid that allows it to resist an external force due to the cohesive nature of its molecules, but it is not directly related to the resistance of a liquid to flow. Boiling point (D) is the temperature at which a liquid changes to a vapor and is not a measure of the resistance of a liquid to flow.
2. During which phase of the cardiac cycle do the atria contract, pushing blood into the ventricles?
- A. Atrial diastole
- B. Ventricular systole
- C. Atrial systole
- D. Ventricular diastole
Correct answer: C
Rationale: Atrial systole is the phase of the cardiac cycle during which the atria contract, pushing blood into the ventricles. This occurs after the atria have been filled during atrial diastole. Ventricular systole refers to the phase when the ventricles contract to push blood out of the heart, not when the atria contract. Ventricular diastole is the phase when the ventricles relax and fill with blood, not when the atria contract. Therefore, the correct answer is atrial systole as it specifically describes the atrial contraction phase.
3. What is the difference between mass and weight?
- A. Mass is the amount of matter in an object, whereas weight is the force of gravity acting on an object.
- B. Mass is a measure of inertia, whereas weight is a measure of the force of gravity acting on an object.
- C. Mass is measured in pounds, whereas weight is measured in kilograms.
- D. Mass is a vector quantity, whereas weight is a scalar quantity.
Correct answer: A
Rationale: Mass is the amount of matter in an object and is a scalar quantity, whereas weight is the force of gravity acting on an object and is a vector quantity. Mass remains constant regardless of the location, while weight can vary depending on the strength of gravity at different locations. Answer choice A correctly defines the difference between mass and weight, making it the correct answer. Choice B is incorrect because mass is not a measure of inertia. Choice C is incorrect as mass is typically measured in kilograms, not pounds. Choice D is incorrect as mass is a scalar quantity, and weight is a vector quantity.
4. Which part of the brain is responsible for controlling voluntary muscle movements?
- A. Cerebrum
- B. Cerebellum
- C. Medulla oblongata
- D. Thalamus
Correct answer: A
Rationale: The correct answer is the Cerebrum. The cerebrum, the largest part of the brain, controls voluntary muscle movements, along with cognitive functions like thinking, perception, and decision-making. It is crucial for motor coordination and the regulation of voluntary movements. The Cerebellum (Choice B) is responsible for coordinating movement, balance, and posture, but not specifically for voluntary muscle movements. The Medulla oblongata (Choice C) is involved in controlling autonomic functions like breathing and heart rate, not voluntary muscle movements. The Thalamus (Choice D) acts as a relay station for sensory information but is not primarily responsible for controlling voluntary muscle movements.
5. Which of the following hormones is produced by the adrenal medulla and prepares the body for a stressful situation?
- A. Testosterone
- B. Cortisol
- C. Epinephrine (adrenaline)
- D. Growth hormone
Correct answer: C
Rationale: The correct answer is C: Epinephrine (adrenaline). Epinephrine is produced by the adrenal medulla and is responsible for preparing the body for a stressful situation. It increases heart rate, dilates airways, and mobilizes energy stores to help the body respond to a fight-or-flight scenario. Testosterone (Choice A) is a sex hormone produced by the testes in males and in smaller amounts by the ovaries in females, not by the adrenal medulla. Cortisol (Choice B) is a stress hormone produced by the adrenal cortex, not the adrenal medulla. Growth hormone (Choice D) is produced by the pituitary gland and is involved in growth, metabolism, and various bodily functions, not by the adrenal medulla.
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