Multiple Choice #23-45 A) Sensory and somatic B) Motor and visceral what are the

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Multiple Choice #23-45 A) Sensory and somatic B) Motor and visceral what are the two major functional divisions of the peripheral nervous systems C) Sensory and motor D) Voluntary and visceral 24. Which of the following is NOT characteristic of neurons? A) Impulse conduction C) High mitotic rate B) Extreme longevity D) High metabolic rate w aan cell 25. The part of a neuron that receives incoming signals called graded potentials is called a A) Akon B) Dendrite C) Axolemma 26. The concentration neurotransmitters in the fluid of the synaptic cleft must be tightly regulated for of the synaptic cleft must be tightly regulated for neurons to function properly. Which of the following cells is most responsible for aiding in this regulation? D) Oligodendrocytes A) Astrocytes B) Microglial cells | C) Schwann cells 27. Immediately after an action potential has peaked which of the following channels will open to begin repolarization A) Voltage gated sodium channels C) Voltage gated calcium channels B) Chemically gated chloride channels D) Voltage gated potassium channels 28. Action potentials occur as a result of sudden change in membrane potential called A) Depolarization B) Repolarization C) Hyperpolarization D) Polarization 29. Which statement best describes hyperpolarization and the key ions involved? A) Intracellular charge is higher than resting state due to a sudden influx of K+ ions B) Intracellular charge is lower than resting state due to continued efflux of K+ ions C) Intracellular charge begins to reach resting state as Na+ ion influx begins to decline. D) Intracellular charge begins to reach threshold due to a sudden influx of Na+ ions. 30. What is the deep area of cerebral gray matter that inhibits unnecessary or antagonistic movements? A) Cerebral cortex B) Pons C) Hypothalamus D) Basal nuclei 31. Vital reflex centers for the control of heart rate, respiration, and blood pressure are located in the A) Pons B) Medulla oblongata C) Cerebellum D) Cerebrum 32. Loss of ability to perform skilled motor activities such as piano playing, with no paralysis or weakness in specific muscles, might suggest damage to the A) Spinal cord B) Premotor cortex C) Primary motor cortex D) Ventral roots 33. Which area of the brain is responsible for complex problem solving, intellectual capability and working memory? A) Reticular activating center C) Pre-frontal cortex D) Choroid plexus 4. Damage to which area of the diencephalon may cause problems with sleep due to a lack of melatonin production? ) Pineal gland B) Hypothalamus C) Thalamus D) Amygdaloid body Which of the following substances can actually cross the blood brain barrier? Metabolic wastes B) High levels of K+ C) Lipid soluble gas anesthesia D) Peripheral blood Vhich area of the cerebrum receives general sensations from skin, bones, tendons, ligaments and skeletal muscle st-central gyrus B) Pre-central gyrus C) Occipital association area D) Temps ich of the following is NOT a way that sensory receptors are classified? ulus type B) Body location C) Structural differences D) Receptor de

Explanation / Answer

23) c) Sensory and Motor

24) c) High mitotic rate

25) b) Dendrite

27) d) Voltage gated potassium channels

30) d) Basal Nuclei

31) b) Medulla oblongata

32) b) premotor cortex

33) c) Pre-frontal cortex

34) a) Pineal gland

35) c) Lipid soluble gas anesthesia

36) a) Post-central gyrus

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