Free PAX (NLN) Questions and Answers

Question 1

Shields the stomach wall from the gastric juices' acidity.

Accepted Answer

Mucus

Answer

Mucus is the substance that protects the stomach wall from the acidity of gastric juices. The stomach lining produces a layer of mucus that covers its inner surface, acting as a protective barrier. Gastric juices, which include hydrochloric acid and enzymes, are secreted by the stomach to aid in digestion. However, these juices are highly acidic and can potentially damage the stomach wall. The mucus layer acts as a physical barrier, preventing direct contact between the gastric juices and the stomach lining. It helps to maintain a suitable pH and protect the stomach tissues from the corrosive effects of the acidic environment.

Question 2

Situated on the right ventricle's floor. The autonomic nervous system, which has complete control, regulates functions including appetite, thirst, sleep, and sexual response. also controls hormone secretion, emotions, blood pressure, and body temperature.

Accepted Answer

Hypothalamus

Answer

The structure you are referring to is the hypothalamus. The hypothalamus is a small region located at the base of the brain, specifically on the floor of the third ventricle. It plays a vital role as the master control center of the autonomic nervous system and is involved in regulating numerous essential functions in the body.

Question 3

Situated underneath the brain. role is to keep posture and balance while also coordinating muscular action.

Accepted Answer

Cerebellum

Answer

The structure you are referring to is the cerebellum. The cerebellum is located under the cerebrum, towards the back of the brain. It is responsible for coordinating muscle movement and plays a crucial role in maintaining posture and balance.

Question 4

Genetic material exchanged during prophase 1 of meiosis between homologous chromosomes.

Accepted Answer

Crossing over

Answer

Crossing over is the exchange of genetic material between homologous chromosomes during prophase I of meiosis, and it is a key source of genetic variation. The other options ('steps of meiosis,' 'parietal lobe,' 'frontal lobe') don't name this specific exchange process.

Question 5

To coordinate movements of fins, such as those of the fingertip, nuclei cooperate with the cerebellum.

Accepted Answer

Basal ganglia

Answer

The basal ganglia, a group of structures located deep within the brain, work in coordination with the cerebellum to coordinate fine motions, including fingertip movements.

PAX Exam Practice Test

PAX Exam Practice Test

Free PAX (NLN) Questions and Answers