Fundamentals of Human Physiology Exam 3 Flashcards Quizlet PDF

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7/3/2021

Fundamentals of Human Physiology Exam 3 Flashcards | Quizlet

Fundamentals of Human Physiology Exam 3 Terms in this set (46)

What is a motor unit?

T/F: Muscle spindles sense

A motor neuron and all the muscle fibers it innervates

False

muscle tension

Contraction of skeletal muscle

Motor neurons

fibers is stimulated by what type of neuron?

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During the cross bridge cycle,

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The myosin head to detach from actin

ATP binding to myosin causes which of the following?

The contractile protein of the

Actin

thin filament is composed of what protein?

During skeletal muscle

slide past one another

contraction, as the muscle shortens, the thick and thin filaments

The binding of calcium to

The movement of tropomyosin, thereby exposing

troponin will directly allow

the myosin binding site on the actin molecule

which of the following?

The speed with which the

The type of myosin and its ATPase present

skeletal muscle generates force is determined primarily by

The shortening of skeletal

Shortening of the sacromeres

muscle fiber during contraction involves which of the follow?

The repeated, oscillating

Cross bridge cycle

interaction between actin and myosin that results in the generation of force by a skeletal muscle cell is called what?

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What converts the myosin

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ATP is hydrolyzed in ADP + Pi

head into the high energy state?

The release of an inorganic

Power Stroke

phosphate from the myosin molecule directly results in which of the following?

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In order for the cross bridge

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bind of ATP to myosin

cycling to occur, the actinmyosin complex must be broken by what?

What type of cell is the

megakaryocytes

precursor for platelet?

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Which of the following

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P wave

components of an ECG represents atrial depolarization?

What phase of the cardiac

isovolumetric

cycle is the heart in when all four valves of the heart are closed and ventricular pressure is building, but is not yet great enough to open a valve?

A normal hematocrit is

45

approximately what value?

The rapid depolarization phase

Calcium

of a pacemaker cell action potential is caused by movement of what ion?

The heart rate is normally

SA node

initiated where?

Closure of the atrioventricular

pressure inside the ventricle is greater than pressure

valve occurs when

inside the atrium

lack nuclei and mitochondria. They contain large Characteristic of Erythrocytes..

amounts of hemoglobin and they transport oxygen and carbon dioxide

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Resistance to blood flow is

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Arterioles

regulated primarily by what blood vessel?

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Systolic is 128

2/3(82)+1/3(128)

Diastolic is 82

=97

What is the mean arterial pressure?

Cardiac output is determined

Heart rate and stroke volume

by what two variables?

T/F Compared to the systemic

True

system, the pulmonary system is at a lower pressure.

What are the three types of muscle?

What muscle makes up the

Cardiac Smooth Skeletal

Skeletal

muscular system?

What muscle is only found in

Cardiac

the heart?

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What muscle appears

Smooth

throughout the body systems as components of hollow organs and tubes?

What is a muscle fiber?

single skeletal muscle cell

What is a neuromuscular

the site where a motor neuron stimulates a muscle

function?

fiber

What is a motor end plate?

Area of the muscle fiber sarcolemma where a motor neuron stimulates it using the neurotransmitter. ACh

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What type of protein is in the

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Myosin

thick filaments?

What type of protein is in the

Actin

thin filaments?

Dark bands, contains thick

A bands

filament are

Light bands, only contains actin

I bands

are

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A sarcomere is

What kind of protein is actin?

What are two other regulatory

A functional Unit between 2 Z lines

Contractile protein

tropomyosin and troponin

proteins?

tropomyosin

lies alongside groove of actin. Resting, covers myosin binding sites blocking interaction

Made up of three units Troponin

Binds to tropomyosin binds to actin binds to Ca2+

Cross bridge Cycle Step One

Attachment of a cross bridge to a thin filament

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Crossbridge Cycle Step Two

Cross bridge Cycle Step Three

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Movement of the cross bridge, producing movement of the thin filament

Detachment of the cross bridge from the thin filament

Movement of the cross bridge into a position where Cross bridge Cycle Step Four

it can again reattach to a thin filament and repeat cycle

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When the sliding of muscle

Fundamentals of Human Physiology Exam 3 Flashcards | Quizlet

A band stays the same length, I band gets shorter

occurs...

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