ATI TEAS 7 Science

Correct Answer: A

Rationale: Diastole is the correct answer because it specifically refers to the relaxation phase of the heart muscle. During diastole, the heart fills with blood before contracting in systole. Systole is the contraction phase, not relaxation. Asystole is the absence of heart contractions, not relaxation. Cardiastole is not a recognized term in relation to the heart's relaxation. Therefore, diastole is the most appropriate term for describing the relaxation of the heart muscle.

Correct Answer: B

Rationale: The correct answer is B: Remodeling. Bone remodeling is the process of breaking down and rebuilding bone tissue to maintain bone strength and repair micro-damage. It involves osteoclasts breaking down old bone and osteoblasts forming new bone. Ossification (A) is the process of bone formation. Calcification (C) is the deposition of calcium salts in tissues. Osteoporosis (D) is a condition characterized by weakened bones due to loss of bone density, not the process of breaking down and rebuilding bone tissue.

Correct Answer: C

Rationale: The correct answer is C: Electroencephalogram (EEG). EEG is used to record the electrical activity of the brain by placing electrodes on the scalp. It is specifically designed to measure brain waves. A CAT scan (A) uses X-rays to create detailed images of the brain's structure, not its electrical activity. An MRI scan (B) uses magnetic fields to produce detailed images of the brain's anatomy, not its electrical activity. X-ray (D) is used to visualize bones and dense tissues, not brain activity. EEG is the only option that directly measures the brain's electrical activity, making it the correct choice.

Correct Answer: B

Rationale: The correct answer is B: Tendons. Tendons are tough connective tissues that attach skeletal muscles to bones. They transmit the force generated by muscles to the bones, allowing movement. Ligaments (A) connect bones to other bones, not muscles. Cartilage (C) is a firm, flexible connective tissue found in joints, not directly involved in muscle attachment. Fascia (D) is a connective tissue that surrounds muscles, but it does not directly attach muscles to bones.

Correct Answer: D

Rationale: In osmosis, solvent moves from an area of low solute concentration to high solute concentration to equalize concentration. This is due to the principle of diffusion where molecules move from high to low concentration. Choice D is correct as it aligns with this principle. Choice A is incorrect because osmosis involves solvent movement, not solute movement. Choices B and C are incorrect as temperature does not determine the direction of solvent movement in osmosis.