ATI TEAS 7 Science

Correct Answer: B

Rationale: The correct answer is B: The ability to maintain a stable internal environment. Homeostasis is the body's ability to regulate and maintain a stable internal environment despite external changes. This includes maintaining stable levels of temperature, pH, and nutrients. Choice A is incorrect because homeostasis is not solely about body temperature. Choice C is incorrect as it does not encompass the overall concept of homeostasis. Choice D is incorrect because although regulating blood glucose levels is part of homeostasis, it does not fully capture the broad scope of maintaining a stable internal environment.

Correct Answer: A

Rationale: The correct answer is A: Hypothalamus. The hypothalamus plays a vital role in regulating body temperature by responding to internal and external temperature changes. It coordinates the body's response to maintain a stable temperature through processes like sweating or shivering. B: Cerebellum is responsible for coordinating movement and balance, not body temperature regulation. C: Pituitary gland regulates hormone production but not directly involved in body temperature regulation. D: Thyroid gland controls metabolism and energy levels but not primarily responsible for regulating body temperature.

Correct Answer: C

Rationale: The primary function of the lymphatic system is to fight infection and remove excess fluid. Lymph nodes contain white blood cells that help fight pathogens. Lymphatic vessels collect excess fluid from tissues and transport it back to the bloodstream, aiding in immune response. Other choices are incorrect because A: Oxygen transport is primarily done by the circulatory system, B: Blood filtration is mainly carried out by the kidneys, and D: Hormone transport is primarily through the circulatory system.

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: B

Rationale: The correct answer is B: To secrete digestive enzymes. The pancreas secretes enzymes such as amylase, lipase, and proteases that help break down carbohydrates, fats, and proteins in the small intestine. This aids in the digestion and absorption of nutrients. Storing bile (A) is the role of the gallbladder, digesting proteins (C) is primarily done by the stomach and small intestine, and absorbing nutrients (D) mainly occurs in the small intestine.