BIO 210 Lecture Exam #4 Questions and Answers 100% Pass

BIO 210 Lecture Exam #4 Questions and Answers 100% Pass A posterior root contains A) sensory axons only B) motor axons only C) a mix of sensory and motor axons D) autonomic nervous system axons - Answer- A) sensory axons only The white matter of the spinal cord is surrounded by gray matter. A) True B) False - Answer- B) False If a patient experiences numbness in the boundaries of a dermatome, it is suggestive of damage to A) the somatosensory cortex B) the thalamus C) one of the spinal funiculi D) the anterior horn of grey matter in the spinal cord E) a spinal nerve - Answer- E) a spinal nerve The plexuses that lie on either side of the neck are the __________ plexus. A) cervical B) brachial C) lumbar D) radial E) mandibular - Answer- A) cervical The largest and longest nerve in the body is the __________ nerve. A) femoral B) radial C) sciatic D) obturator E) saphenous - Answer- C) sciatic Reflexes are described as A) slow and spontaneous B) spontaneous and self-initiating C) pre-programmed and voluntary D) rapid and involuntary - Answer- D) rapid and involuntary Usually, awareness of the stimulus occurs before a reflex action has been initiated. A) True B) False - Answer- B) False What is the correct order for the events that occur during a reflex? a: Impulse travels through sensory neuron to the CNS b: A stimulus activates a receptor c: Information is processed by interneurons d: Motor neuron transmits impulse to effector e: Effector responds A) a, b, c, d, e B) b, a, c, d, e C) c, b, a, e, d D) c, a, b, d, e E) b, d, c, a, e - Answer- B) b, a, c, d, e A reflex arc in which both the receptor and the effector organs of the reflex are on the same side of the spinal cord is A) monosynaptic B) polysynaptic C) ipsilateral D) contralateral E) None of the choices are correct - Answer- C) ipsilateral The simple knee-jerk reflex is an example of a(n) __________ reflex. A) ipsilateral B) contralateral C) monosynaptic D) crossed-extensor E) multisynaptic - Answer- C) monosynaptic