MEDICAL PHYSIOLOGY

Detailed explanation-1: -The nerves have an equally amazing network that can both transport and “store” blood for your nerves. How amazing are networks? Nerves are always close to major systems of blood. If you find a nerve, you will find a large artery ready to provide blood to the nerve.

Detailed explanation-2: -The answer is (d): neurons are only found in the central nervous system. Neurons and neuroglia are ubiquitous in the entire nervous system and are not specific to the central nervous system. The other answers are correct: The spinal cord tracts go both toward the brain (afferent) and go away from the brain (efferent).

Detailed explanation-3: -Recent findings: Dr. Armour, in 1991, discovered that the heart has its “little brain” or “intrinsic cardiac nervous system.” This “heart brain” is composed of approximately 40, 000 neurons that are alike neurons in the brain, meaning that the heart has its own nervous system.

Detailed explanation-4: -The nervous system subdivides into the central nervous system and the peripheral nervous system. The central nervous system is the brain and spinal cord, while the peripheral nervous system consists of everything else.