What is a reflex arc? What components must be present to qualify?
What will be an ideal response?
A reflex arc is the wiring pattern of neurons that underlie a particular reflex. A reflex arc consists of three elements at the minimum: (1 ) a sensory receptor and neuron to carry afferent information to the CNS; (2 ) an excitatory synapse on a motor neuron; (3 ) the motor neuron to generate an action potential and conduct the impulse to an effector such as a skeletal muscle motor unit.
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Which of the following types of cells display the property of electrical excitability?
a) Muscle cells b) Neurons c) All of these choices d) None of these choices
The nerve in the lower limb controlling posterior muscles like the gastrocnemius and plantaris is the ________ nerve, and it most closely resembles the radial nerve in the upper limb.
A) tibial B) deep fibular C) pudendal D) femoral E) fibular
Which of the following features account(s) for the greater acuity that occurs in cones, relative to the rods?
a. Different cone opsins have different absorbance maxima for wavelengths of light. b. There is little convergence in the cone system. c. Cones are less sensitive (require a stronger stimulus) than rods. d. All of these contribute to acuity. e. None of these influence acuity.
The common ________ veins converge at the level of L5 to form the inferior vena cava.
Fill in the blank(s) with the appropriate word(s).