The nurse notes that a patient has a history of falling. Which part of the brain should the nurse question as being affected in this patient?

Correct Answer: B

Rationale: The cerebellum is responsible for coordination, balance, and posture, making it the most likely area affected in a patient with a history of falling. The medulla regulates vital functions, the frontal lobes control voluntary movement, and the hypothalamus maintains homeostasis. The cerebellum's role in motor control is essential for assessing balance issues.

Correct Answer: D

Rationale: The parasympathetic division of the autonomic nervous system is responsible for 'rest and digest' functions, such as digestion and relaxation. The sympathetic division mediates the 'fight-or-flight' response, while the cerebral hemispheres are involved in higher cognitive functions. Understanding the autonomic nervous system is key to explaining physiological responses.

Correct Answer: C

Rationale: The correct answer is C because acetylcholine actually increases digestion by stimulating the release of digestive enzymes and promoting peristalsis. A is incorrect because norepinephrine dilates the pupil, B is incorrect because epinephrine does increase blood pressure, and D is incorrect because norepinephrine does increase heart rate. Remember, acetylcholine is primarily responsible for parasympathetic responses, which include rest and digest functions.

Correct Answer: D

Rationale: The correct answer is D: neurotransmitters. Neurons store and release neurotransmitters in response to signals to communicate with other neurons or target cells. Neurotransmitters play a crucial role in transmitting signals across synapses. Toxins (A) are harmful substances, not involved in neuronal communication. Cytokines (B) and chemokines (C) are signaling molecules involved in immune responses, not neuronal communication. Therefore, the correct choice is neurotransmitters.

Correct Answer: A

Rationale: The correct answer is A: Naegleria fowleri. This is because Naegleria fowleri is known to be the causative agent of primary amoebic meningoencephalitis, a rare but serious infection of the brain. This amoeba enters the body through the nasal passages and travels to the brain, causing inflammation and damage. Entameba histolyticum is a different species of amoeba that causes amoebiasis, a gut infection. Amoeba proteus is a harmless freshwater amoeba used in biology studies. Acanthamoeba polyphaga can cause infections in immunocompromised individuals but is not associated with primary amoebic meningoencephalitis.