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Exam 2
Information from exam 2
| Question | Answer |
|---|---|
| During saltatory conduction | APs occur between successive nodes along the length of stimulated axon |
| MS is associated with a loss of myelin. MS involves | Oligodendrocytes |
| The later part of the rising phase of the action potential is mediated by what kind of ion membrane channel? | Voltage-gated |
| What is true about a graded potential? | Stimulus causes ion channels to open changing membrane permeability |
| A resting transmembrane potential of a cell has a value of approximately | -70 mV |
| Opening of Na+ channels in the membrane of a neuron normally results in | Depolarization |
| What prevents an action potential from traveling in both directions down an axon? | Refractory period |
| A better sprinter has more _____ in their leg muscles than marathon runner does | White muscle fibers |
| Smooth but steady increase in muscle tension produced by increasing the number of active motor units is called | Recruitment |
| What is involved in both synaptic transmission and excitation-contraction coupling? | Calcium |
| Which striated muscle band is directly adjacent to the Z-line? | I-band |
| During relaxation, muscles return to their original length not because of | Renshaw inhibition |
| Muscles return to their original length because of | Elastic forces, the pull of gravity, the contraction of opposing muscles, the elastic nature of the sarcolemma |
| At rest, active sites on the actin are blocked by | Tropomyosin molecules |
| Tropomyosin wraps itself around which other muscle element | F-actin |
| The "powerstroke" in skeletal muscle contraction is directly associated with | Myosin head pivots at joint pulling actin |
| We can distinguish between sensations originating in different body areas because | Receptors from each body region synapse in specific brain regions |
| Diffusion across the Arachnoid Granulations returns excess CSF to | Venous circulation |
| Soon after a person dies and loses all ATP, their skeletal muscles | Stiffen from actin and myosin binding |
| Characteristics of smooth muscle | Have small diameters and lengths compared with skeletal muscles, have actin and myosin, have autorhythmicity, little fatigue with prolong contraction |
| Not a characteristic of smooth muscle | Have striations |
| Which of the following is responsible for reciprocal inhibition | Interneurons in the spinal cord |
| People perceive different intensities of light when their brains receive different | Rates of action potentials |
| Part of the brain closely associated with emotions (pleasure and hunger) | Hypothalamus |
| What is responsible for reciprocal inhibition? | Interneurons in the spinal cord |
| Overseeing the postual muscles of the body and making rapid adjustments to maintain balance and equilibrium are functions of the | Cerebellum |
| The cell bodies of the sympathetic preganglionic neurons are in the | Lateral gray horns of T1 through L2 region of the spinal cord |
| Activity of the parasympathetic ANS mainly | Increases while calmly digestion diner |
| The cell bodies of the parasympathetic preganglionic neurons are found in the | Brain stem and lateral gray horns of the sacral area of the spinal cord |
| Of the 31 pairs of spinal nerves, each one monitors a particular | Dermatome |
| Large multinucleated cells that can dissolve the bony matrix are termed | Osteoclasts |
| Appositional growth in bones is most closely related to growth in | Bone diameter |
| What decreases the concentration of calcium in the blood | Calcitonin |
| The "shaft" of a long bone is most closely associated with the | Diaphysis |
Created by:
nke1992
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