ATI TEAS Practice Science Test

Correct Answer: A

Rationale: The correct answer is A: Cranial and spinal. The dorsal cavity is divided into two subdivisions: the cranial cavity, which contains the brain, and the spinal cavity, which houses the spinal cord. This division corresponds to the anatomical locations of these structures within the back of the human body. Explanation: 1. The cranial cavity is located in the skull, specifically protecting the brain. 2. The spinal cavity runs through the vertebral column, safeguarding the spinal cord. 3. These subdivisions are anatomically and functionally distinct, housing vital components of the central nervous system. Summary: B: Dorsal and ventral - Incorrect. Dorsal and ventral refer to the front and back sides of the body, not specific cavities within the back. C: Lateral and proximal - Incorrect. Lateral and proximal describe directions in relation to the body, not cavities within the back. D: Inferior and superior - Incorrect. Inferior and superior

Correct Answer: A

Rationale: The correct answer is A: Flagellum. Cells rely on flagella for movement because flagella are whip-like structures that enable cells to propel themselves through fluid environments. Flagella are composed of microtubules, which provide structural support and enable movement through their bending and contracting motion. Microtubules alone (B) do not facilitate movement; they serve as a scaffold within cells. Pili (C) are short, hair-like structures used for attachment rather than movement. Vesicles (D) are membrane-bound sacs involved in transportation within cells, not in cell movement. Therefore, flagellum is the most suitable structure for cellular movement.

Correct Answer: D

Rationale: The correct answer is D: Bottom of the uterus. The cervix is the lower narrow end of the uterus that connects to the top of the vagina. It serves as a passage for menstrual blood to exit the body and for sperm to enter the uterus. The other choices are incorrect because the cervix is not located at the top of the uterus (A), top of the ovaries (B), or bottom of the vagina (C). Understanding the anatomical structure and function of the female reproductive system is key to selecting the correct answer.

Correct Answer: D

Rationale: The correct answer is D: Oxygen. 1. Oxygen has 8 electrons in total, with 2 in the first shell and 6 in the second shell, following the 2-8-8 electron configuration rule. 2. Beryllium has 4 electrons with 2 in the first shell and 2 in the second shell. 3. Carbon has 6 electrons with 2 in the first shell and 4 in the second shell. 4. Helium has 2 electrons, filling the first shell. Therefore, Oxygen is the only element among the choices that fits the description of having 2 electrons in the first shell and 6 electrons in the second shell.

Correct Answer: A

Rationale: The correct answer is A: ATP. ATP (adenosine triphosphate) is required to drive the sliding filament process during muscle contraction by providing energy for the myosin heads to bind to actin and generate movement. ATP is directly involved in the process of cross-bridge formation and power stroke. Hormones (B) do not directly drive muscle contraction. Potassium (C) is involved in muscle cell excitability but not in the sliding filament process. Water (D) is not directly involved in muscle contraction.