1 Messages from the skin and joints are sent to the brain via the a) visceral af
ID: 255804 • Letter: 1
Question
1 Messages from the skin and joints are sent to the brain via the a) visceral afferent division; b) somatic efferent division; c) autonomic nervous system; d) somatic afferent division; e) efferent tracts. 2.Which of the following is not characteristic of neurons? a) they respond to chemical stimuli; b) they have high metabolic rates; c) they have high mitotic rates; d) they release chemical regulators; e) they respond to physical stimuli. 3. The cell body of a neuron is called the a) Nissl body; b) perikaryon; 4 Myelin sheaths in the central nervous system are formed by 5. Phagocytic cells which remove foreign material within the CNS are c) axon hillock; d) telodendria; e) ganglion. a) astrocytes; b) microglia; c) Schwann cells; d) ependyma; e) oligodendrocytes called a) satellite cells; b) microglia; c) ependyma; d) astrocytes; e) Schwann cells. Areas on a nerve fiber that are recessed in a simple groove in a Schwann cell are called a) unmyelinated; b) nodes of Ranvier; c) myelin sheaths; d) neurilemmal sheaths; e) myelinated. 6. 7. The most common type of neuron is a) bipolar; b) sensory; c) multipolar; d) pseudounipolar; e) association 8. The connective tissue that surrounds and binds an entire nerve is called a) endoneurium; b) fasciculus; c) epineurium; d) neurilemma; e) perineurium The separation of electrical charges across a barrier represents a high d) potential; e) ohms. 9 energy state known as a) current; b) resistance; c) amperesExplanation / Answer
1) SOmatic afferent division
The somatic afferent nerves carry the signals from skin and joints to the brain where as the somatic efferent nerve carry signals from the brain to the skeletal muscles
2) High mitotic rate
Neurons are diffrentiated anddo not divide and therefore they do not have a high mitotic rate.
Neurons on the other hand have a very high metabolic rateand hence cannot survive for long without oxygen. when provide with a chemical or physical stimuli, they send signals via a nervous impulse.
3) Axon hillock
Axon hillock? is the other name of the cell body of a neuron. The axon hillock leads to the axon.
4) Schwann cells
Schwann cells arround the axon of a neuron forms the myelin sheath
5) Microglia
Microglia are the resident macrophage cells, that act as the main form of active immune defence in the central nervous system (CNS).?
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