TEAS 7 Science Practice Test

Correct Answer: C

Rationale: The correct answer is C: At the center of the brain hemispheres. The pineal gland is located in the brain, specifically at the center of the brain hemispheres. It is a small endocrine gland responsible for secreting melatonin, a hormone that regulates sleep-wake cycles. Choices A, B, and D are incorrect because the pineal gland is not located below the larynx, above the kidney, or at the base of the brain. The pineal gland's location in the center of the brain makes it unique and vital for regulating various physiological functions.

Correct Answer: A

Rationale: The correct answer is A because fascia functions to enclose, protect, support, and separate muscle tissue. Fascia is a connective tissue that surrounds muscles, providing structural integrity, protecting muscles from friction, and allowing for movement while maintaining muscle shape. It also separates muscles into compartments, assisting in the coordination of muscle actions. Choices B, C, and D are incorrect because fascia does not primarily connect muscle tissue to bone, serve as the contractile unit of muscle, or directly interact with actin protein cells to create muscle contractions.

Correct Answer: A

Rationale: The correct answer is A: smooth endoplasmic reticulum. The smooth endoplasmic reticulum is the site of lipid synthesis due to the presence of enzymes involved in lipid metabolism. It lacks ribosomes, unlike the rough endoplasmic reticulum, which is primarily involved in protein synthesis. The Golgi apparatus functions in processing and packaging proteins for secretion. Ribosomes are involved in protein synthesis, not lipid synthesis. Therefore, the smooth endoplasmic reticulum is the organelle responsible for lipid synthesis.

Correct Answer: A

Rationale: The correct answer is A: capillaries. Capillaries are tiny blood vessels where the exchange of oxygen and nutrients occurs between the blood and tissues through diffusion. Capillaries have thin walls to facilitate the exchange process efficiently. Veins carry blood back to the heart, ventricles are chambers of the heart, and arteries carry blood away from the heart. Thus, they are not sites for oxygen exchange between blood and tissues.

Correct Answer: D

Rationale: The correct answer is D: conducting and respiratory. The conducting zone consists of structures that conduct air to the respiratory zone where gas exchange occurs. The respiratory zone includes the alveoli where oxygen is absorbed and carbon dioxide is released. Choices A, B, and C do not accurately represent the major zones of the respiratory system. The left and right bronchi are part of the conducting zone, not major zones. The nose and mouth are entry points but not major zones. The larynx and pharynx are part of the upper respiratory tract, not major zones.