ati teas 7 science

Correct Answer: B

Rationale: The correct answer is B: Synapse. The synapse is the point of contact between a motor neuron and a muscle fiber where communication occurs via neurotransmitters like acetylcholine to initiate muscle contraction. A: Sarcomere is a structural unit of a muscle fiber, not the point of contact for communication. C: Tendon is a fibrous connective tissue that attaches muscle to bone, not involved in neuron-muscle communication. D: Myofibril is a cylindrical organelle within muscle fibers where muscle contractions occur, but it is not the specific point of contact for neuron communication.

Correct Answer: D

Rationale: The correct answer is D, Collagen. Collagen is a fibrous protein known for its structural role in connective tissues. It has a triple helix structure, providing strength and support to tissues. Insulin (A) is a hormone, not a fibrous protein. Keratin (B) is a structural protein found in hair and nails. Hemoglobin (C) is a globular protein responsible for oxygen transport in red blood cells. Therefore, collagen is the only fibrous protein among the choices.

Correct Answer: B

Rationale: The primary function of the small intestine is to absorb nutrients from digested food. This process involves breaking down food into smaller molecules that can be absorbed into the bloodstream for energy and growth. The small intestine has villi and microvilli that increase its surface area for efficient nutrient absorption. Choice A is incorrect because the large intestine, not the small intestine, primarily absorbs water. Choice C is incorrect as the large intestine, not the small intestine, stores waste. Choice D is incorrect because while the small intestine does produce some enzymes, its primary role is nutrient absorption.

Correct Answer: B

Rationale: The correct answer is B (25 grams) as the recommended daily fiber intake for adults by the American Heart Association is 25-30 grams. Fiber helps with digestion, heart health, and weight management. Option A (10 grams) is too low and insufficient for daily needs. Option C (35 grams) and D (50 grams) are excessive and may lead to digestive issues like bloating or gas. Therefore, B is the most appropriate choice for optimal health benefits.

Correct Answer: C

Rationale: The correct answer is C: Isotonic solution. An isotonic solution has the same concentration of solute as another solution, leading to no net movement of water across a semipermeable membrane. This term is commonly used in biology and medicine to describe solutions with equal osmotic pressure. Incorrect answers: A: Saturated solution - A saturated solution is one in which the maximum amount of solute has been dissolved at a given temperature. B: Unsaturated solution - An unsaturated solution has a lower concentration of solute compared to what it could dissolve at a given temperature. D: Concentrated solution - A concentrated solution simply means a solution with a high amount of solute dissolved in a solvent, but it does not necessarily mean it has the same concentration as another solution.