The orthopedic surgeon informs you that you have broken the distal region of the humerus.

What area is he describing?.

Superficial wound healing.

Cellular contact inhibition is important in this process because it prevents cells from migrating and proliferating excessively when the wound is closed. Contact inhibition is a cell property that limits the migration and proliferation of cells in crowded environments.

Choice A is wrong because sweat production does not involve contact inhibition. Sweat glands secrete sweat through ducts that open onto the skin surface.

Choice C is wrong because scoliosis development does not involve contact inhibition. Scoliosis is a condition that causes the spine to curve sideways, and it can be caused by genetic, environmental, or unknown factors.

Choice D is wrong because tyrosinase production does not involve contact inhibition.

Tyrosinase is an enzyme that catalyzes the production of melanin, a pigment that gives color to the skin, hair, and eyes.

Chemoreceptors are specialized sensory receptors that detect changes in the chemical composition of the blood, such as the partial pressure of oxygen (PO2) and carbon dioxide (PCO2) and the pH level.

Chemoreceptors can be classified into two types: peripheral and central. Peripheral chemoreceptors are located in the aortic and carotid bodies and they mainly respond to low PO2, but also to high PCO2 and low pH. Central chemoreceptors are located in the brainstem and they mainly respond to high PCO2 and low pH, which reflect the concentration of hydrogen ions in the cerebrospinal fluid. Both types of chemoreceptors send signals to the respiratory and cardiovascular centers in the brainstem, which regulate breathing and blood pressure accordingly.

Pulmonary congestion. This statement is wrong because pulmonary congestion is not directly sensed by chemoreceptors, but by pulmonary stretch receptors, which are different types of sensory receptors located in the lungs

Nearsightedness or myopia is a condition that causes a client to say, “I can’t see things far away?”. This is because the point of focus is in front of the retina, making distant objects appear blurry.

Choice A. Blindness is wrong because it means the complete loss of vision in one or both eyes.

A blind person cannot see anything, near or far.

Choice B. Farsightedness is wrong because it means the opposite of nearsightedness. Farsightedness or hyperopia is a condition that causes a client to see distant objects clearly, but sees near objects as blurry. This is because the point of focus is behind the retina, making close objects appear blurry.

Choice C. Astigmatism is wrong because it is not a condition that affects the distance of vision, but the shape of the cornea. Astigmatism is an irregularity in the curve of the cornea, which can affect both near and distant vision. A person with astigmatism may see objects as distorted or blurry at any distance.

Carotid artery.

The carotid artery is a major blood vessel that supplies blood to the head and neck. It can be felt as a pulse on either side of the neck, just below the jawline.

Choice A is wrong because the subclavian artery is located below the clavicle (collarbone) and cannot be felt as a pulse on the neck.

Choice C is wrong because the brachiocephalic artery is a large vessel that branches into the right subclavian and right carotid arteries. It is located deep in the chest and cannot be felt as a pulse on the neck.

Choice D is wrong because the basilar artery is a vessel that forms at the base of the brain from the union of the two vertebral arteries. It cannot be felt as a pulse on the neck.

The normal range for pulse rate in adults is 60 to 100 beats per minute.