BIOS 252 midterm review 2

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BIOS 252 midterm review 2

• Neuron

–Answer a specialized cell transmitting nerve impulses; a nerve cell.

• Sacromere

–Answer contractile unit of a muscle fiber

• neuron characteristics

–Answer excitability, conductivity, secretion, extreme longevity, amitotic(do not divide)

• ependymal cells

–Answer produce and circulate cerebrospinal fluid

• Ganglia

–Answer clusters of cell bodies in the PNS

• spinal fluid

–Answer circulating fluid in the brain and spinal cord clear, odorless, and colorless

• Wallerian degeneration

–Answer degeneration of the distal portion of the axon and myelin sheath

• muscles used in forced expiration

–Answer abdominal muscles and internal intercostal muscles 1 / 2

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• Muscles used for breathing

–Answer diaphragm, external intercostals, internal inter- costals

• Aperneurosis

–Answer a sheet of pearly-white fibrous tissue that takes the place of a tendon in sheetlike muscles having a wide area of attachment.

• prime mover of head

–Answer splenius capitis

• isotonic contraction

–Answer muscle shortens because muscle tension exceeds load

• isomeric contraction

–Answer Tension does not exceed load, length of muscle remains the same. Tension produced never exceeds resistance.

• Tetanus

–Answer individual twitches cannot be detected

• twitch

–Answer The brief contraction of all muscle fibers in a motor unit in response to a single action potential.

• sliding filament theory

–Answer theory that actin filaments slide toward each other during muscle contraction, while the myosin filaments are still

• Axon stimulation

–Answer electrical impulse to neuromuscular junction

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