TEAS Practice Test Science

Correct Answer: C

Rationale: The correct answer is C, interstitial space. Lymph flows through the interstitial space, which is the fluid-filled space between cells in tissues. Arteries and veins carry blood, not lymph. Lumen is the inside space of a tubular structure, such as a blood vessel, and does not specifically refer to where lymph flows. Therefore, the interstitial space is the most appropriate term for the space where lymph flows through the body.

Correct Answer: B

Rationale: The correct answer is B: Scapula. Flat bones are thin, flattened bones that provide protection and allow for muscle attachment. The scapula fits this description as it is a thin, flat bone located on the back of the shoulder. The other choices (A: Femur, C: Humerus, D: Tibia) are long bones that are not thin and flat like flat bones. The femur, humerus, and tibia are all weight-bearing bones with a different shape and function compared to flat bones.

Correct Answer: B

Rationale: The correct answer is B: Liver. The liver is responsible for filtering toxins from the blood through a process called detoxification. It metabolizes and eliminates toxins, drugs, and alcohol from the bloodstream. The kidneys (A) filter waste from the blood but do not primarily handle toxins. The heart (C) pumps blood and does not have a filtration function. The lungs (D) exchange gases and do not filter toxins from the blood. Therefore, the liver is the correct answer for filtering toxins from the blood.

Correct Answer: C

Rationale: The correct answer is C: Natural Killer cells. Natural Killer cells are part of the innate immune response as they can recognize and eliminate infected or abnormal cells without prior exposure. B-cells and cytotoxic T-cells are part of the adaptive immune response, requiring specific antigens to respond. Antigen-Presenting Cells play a crucial role in initiating the adaptive immune response by presenting antigens to T-cells. Therefore, Natural Killer cells are the only cells listed that belong to the innate immune response.

Correct Answer: B

Rationale: The correct answer is B: Parathyroid hormone. PTH is produced by the parathyroid glands and plays a crucial role in regulating calcium levels in the blood. It increases calcium levels by stimulating the release of calcium from bones, enhancing calcium absorption in the intestines, and reducing calcium excretion in the kidneys. Insulin (A) regulates blood sugar levels, not calcium. Thyroid hormone (C) controls metabolism, not calcium levels. Glucagon (D) increases blood sugar levels, not calcium.