What is the primary function of carbohydrates in the human body?

A. Providing energy:Carbohydrates are broken down into glucose, which is the body’s preferred and most efficient fuel source for cellular respiration (ATP production), especially for the brain and muscles during exercise.

B. Building tissues:While some carbohydrates are found in cell markers, the primary "building blocks" of body tissues (muscles, skin, organs) are proteins.

C. Regulating hormones:While some hormones are glycoproteins, the major class of molecules used to synthesize steroid hormones are lipids (specifically cholesterol), and many others are protein-based.

D. Insulating organs:Thermal insulation and physical cushioning of organs is the primary function of lipids (adipose tissue/fat).

A. Autonomic nervous system: Controls involuntary functions such as heart rate, digestion, and temperature regulation. While autonomic neuropathy exists, peripheral neuropathy of extremities is not primarily autonomic.

B. Enteric nervous system: Controls GI tract functions. Not involved in neuropathy affecting limbs.

C. Central nervous system: Includes the brain and spinal cord. Peripheral neuropathy affects nerves outside the CNS.

D. Peripheral nervous system: Peripheral neuropathy is a disorder of the peripheral nerves that transmit sensory and motor signals to the limbs. Causes include diabetes, vitamin deficiencies, toxins, and trauma.