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BIO 2301 LECTURE EXAM 2 QUESTIONS AND VERIFIED ANSWERS

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BIO 2301 LECTURE EXAM 2 QUESTIONS AND VERIFIED ANSWERS

Institution
BIO 2301
Module
BIO 2301

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What factors affect BMR?


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age, gender, weight, thyroid hormones




What mineral is required for thyroid hormone production?


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Iodine




What is the sarcomere and what role does it play with muscle contraction?

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Arrangement of myofibrils to make a functional unit of contraction. Where
contraction happens, and where calcium goes when released from the SR.
h




How is the sarcomere organized? (Z disks, titin, thick/thin filaments, arrangement
within sarcomere)


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Thin filaments are made of actin an connected at z disks. The thick filaments
are made of myosin and anchored by z disks ad titin. The M line is in the
middle. The H zone contains only thick filament, and it decreases with
contraction. The I band is thin filament and it shortens with contraction. The
A band is the entirety of the thick filament.




What roles do epinephrine and norepinephrine have with the response to acute
stress?


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They are activated with the sympathetic response. Increases cardiac output
and respiratory rate. Causes increased mental alertness, dilates coronary
vessels and elevate metabolic rates.




What are the basic overall functions of the endocrine system?


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, Responsible for general homeostasis in the body. Regulates/controls
metabolic processes.
Functions- regulate substances dissolved in the blood, regulates blood
volume, cellular concentration, controls reproductive activities, regulates
development, growth, and metabolism, and controls digestive processes




What is typically damaged with an intention tremor?


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Lesion on the cerebellum




What protein at rest blocks the binding/contraction process from occuring?


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Tropomyosin




What does the term auto-rhythmic mean?


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The ability to contract without neural stimuli




Describe muscle twitch vs tetanus. What produces the maximum force possible for
the muscle cell?

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Twitch is a single action potential. Force is determined by the number of
units contracting and the frequency.
Tetanus is when multiple contractions are occurring.
Fused tetanus produces the greatest amount of force.




Define synergistic/example


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Two or more hormones work together for a specific effect (Epi/Norepi)




What neurotransmitter/specific receptor type do skeletal muscles rely upon for
contraction to occur?


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Neurotransmitter is Ach (acetylcholine). The receptor type is Nicotinic.




What role does calcium and ATP each play in muscle contraction?


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Calcium: causes binding site on actin to be exposed and causes muscle
contraction.
ATP: activate myosin head, binds and releases the actin and myosin.

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Institution
BIO 2301
Module
BIO 2301

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