1.Which of these statements about cross bridges is false? A.They are composed of
ID: 3510737 • Letter: 1
Question
1.Which of these statements about cross bridges is false?
A.They are composed of myosin.
B.They bind to ATP after they detach from actin.
C.They contain an ATPase.
D.They split ATP before they attach to actin.
2.When a muscle is stimulated to contract, Ca2+ binds to
A.myosin.
B.tropomyosin.
C.actin.
D.troponin.
3.Which of these statements about muscle fatigue is false?
A.It may result when ATP is no longer available for the cross-bridge cycle.
B.It may be caused by a loss of muscle cell Ca2+.
C.It may be caused by the accumulation of extracellular K+.
D.It may be a result of lactic acid production.
4.Which of these muscle types is striated and contains gap junctions?
A.Single-unit smooth muscle
B.Multiunit smooth muscle
C.Cardiac muscle
D.Skeletal muscle
5.In an isotonic muscle contraction,
A.the length of the muscle remains constant.
B.the muscle tension remains constant.
C.both muscle length and tension are changed.
D.movement of bones does not occur.
6.Which of the following is an example of an eccentric muscle contraction?
A.Doing a “curl” with a dumbbell
B.Doing a breast stroke in a swimming pool
C.Extending the arms when bench-pressing a weight
D. Flexing the arms when bench-pressing to allow the weight to return to the chest
1.Which of the following statements is not characteristic of smooth muscles?
A.Myosin phosphatase is required for contraction.
B.They are able to conduct graded depolarizations.
C.They can enter a latch state.
D.They can produce graded contractions in response to graded depolarizations.
1.According to the Frank-Starling law of the heart, the strength of ventricular contraction is
A.directly proportional to the end-diastolic volume.
B.inversely proportional to the end-diastolic volume.
C.independent of the end-diastolic volume.
2.In the absence of compensations, the stroke volume will decrease when
A.blood volume increases.
B.venous return increases.
C.contractility increases.
D.arterial blood pressure increases.
Since veins can distend more with pressure, they are called _____ vessels.
A. resistance
B. stretchy.
C. capacitance.
D. Both resistance and stretchy are correct.
The ______________ is equal to the hydrostatic pressure of the blood in the capillaries minus the hydrostatic pressure of tissue interstitial fluid outside the capillaries.
A. net filtration pressure
B. blood pressure
C. osmotic pressure
D. None apply
Net filtration would be decreased by
A. liver damage.
B. increased hepatic protein synthesis.
C. hypotension.
D. increased cellular metabolism.
The opposing forces that affect fluid movements across a capillary are known as
A. oncotic pressures.
B. starling forces.
C. colloid osmotic pressures.
D. None apply.
Hydrostatic pressure is ______ and colloid osmotic pressure is ______ at the arterial end of a capillary.
A. higher, higher
B. higher, lower
C. lower, lower
D. lower, higher
What is the main force that causes fluids to enter the venous end of a capillary?
A. hydrostatic pressure in the capillary
B. hydrostatic force in the interstitial fluid
C. colloid osmotic pressure in the capillary (blood plasma)
D. colloid osmotic pressure in the interstitial fluid
Explanation / Answer
Answers
1. b) They bind to ATP after they detach from actin.
2. d) troponin
3. a) It may result when ATP is no longer available for the cross-bridge cycle.
4. c) Cardiac muscle
5. b) the muscle tension remains constant.
6. d) Flexing the arms when bench pressing to allow the weight to return to the chest
1. a) Myosin phosphatase is required for contraction.
1. a) directly proportional to the end-diastolic volume.
2. d) arterial blood pressure increases.
Since veins can distend more with pressure, they are called _____ vessels.
A. resistance
B. stretchy.
C. capacitance.
D. Both resistance and stretchy are correct.
The ______________ is equal to the hydrostatic pressure of the blood in the capillaries minus the hydrostatic pressure of tissue interstitial fluid outside the capillaries.
A. net filtration pressure
B. blood pressure
C. osmotic pressure
D. None apply
Net filtration would be decreased by
A. liver damage.
B. increased hepatic protein synthesis.
C. hypotension.
D. increased cellular metabolism.
The opposing forces that affect fluid movements across a capillary are known as
A. oncotic pressures.
B. starling forces.
C. colloid osmotic pressures.
D. None apply.
Hydrostatic pressure is ______ and colloid osmotic pressure is ______ at the arterial end of a capillary.
A. higher, higher
B. higher, lower
C. lower, lower
D. lower, higher
What is the main force that causes fluids to enter the venous end of a capillary?
A. hydrostatic pressure in the capillary
B. hydrostatic force in the interstitial fluid
C. colloid osmotic pressure in the capillary (blood plasma)
D. colloid osmotic pressure in the interstitial fluid
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