How does the integumentary system contribute to homeostasis?

A. Optic nerve:The Optic nerve (CN II) is a purely sensory nerve. It connects the retina to the brain, transmitting the electrical impulses generated by light so the visual cortex can interpret them as images.

B. Facial nerve:The Facial nerve (CN VII) is a mixed nerve primarily involved in motor control of facial expressions and sensory taste perception on the anterior tongue.

C. Trochlear nerve:The Trochlear nerve (CN IV) is a motor nerve. It controls the superior oblique muscle of the eye, aiding in looking downward and inward, but does not transmit visual data.

D. Olfactory nerve:The Olfactory nerve (CN I) is the sensory nerve responsible for the sense of smell.

A. Increased bone density:Hyperparathyroidism involves excessive secretion of Parathyroid Hormone (PTH). PTH works to raise blood calcium levels by pulling calcium outof the bones. This reduces, rather than increases, bone density.

B. Bone infection:While bones can get infected (osteomyelitis), this is usually due to bacteria introduced via trauma or surgery, not a hormonal imbalance like hyperparathyroidism.

C. Osteoporosis:Excess PTH stimulates osteoclasts (bone-breaking cells) to break down bone matrix and release calcium into the blood. Chronic breakdown leads to weak, brittle bones (osteoporosis) and a high risk of pathological fractures.

D. Fracture healing enhancement:Because the condition constantly removes calcium from bones to keep blood levels high, the structural integrity of the bone is compromised, hindering rather than helping bone strength and repair.