Neuromuscular System-sem 2 Yr 1

17 Questions | By Scrystl608 | Updated: Mar 21, 2022 | Attempts: 309

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Test one for the neuromsk skel syst 2010 semester 2

Questions and Answers

1.

Where and when does the myosin crossbridge attach?
- A.
  
  On troponin when calcium is low
- B.
  
  On troponin c when calcium is high
- C.
  
  On actin when calcium is high
- D.
  
  On the sarcomere when sodium is high
- E.
  
  On actin when calcium is low
2.

Fiber types within the skeletal muscle generating force and movement are?
- A.
  
  Intrafusal
- B.
  
  Thick filament
- C.
  
  Extrafusal
- D.
  
  Thin filament
- E.
  
  Nuclear chain fibers
3.

What does the process of active state require?
- A.
  
  Extracellular calcium increase
- B.
  
  Intracellular calcium increase
- C.
  
  Intracellular calcium increase and ATP
- D.
  
  Extracellular calcium decrease
- E.
  
  ATP
4.

Contraction is the result of:
- A.
  
  An incease number of crossbridge attachments
- B.
  
  Calcium at its basal level
- C.
  
  An increase of actin filaments
- D.
  
  Decreasing extracellular calcium
- E.
  
  Loss of ATP
5.

Where is the storage facility of ATP in the sarcomere?
- A.
  
  Calcium
- B.
  
  Sodium
- C.
  
  Actin
- D.
  
  Myosin
- E.
  
  Troponin C
6.

If the muscle ends are clamped at a fixed length prior to the contraction, and the muscle length cannot decrease as the muscle's cell contract, is it :
- A.
  
  Concentric contraction
- B.
  
  Isotonic contraction
- C.
  
  Eccentric contraction
- D.
  
  Auxotonic contraction
- E.
  
  Isometric contraction
7.

What is the signal for contraction?
- A.
  
  Sodium
- B.
  
  Actin
- C.
  
  Myosin
- D.
  
  Calcium pulse
- E.
  
  Twitch
8.

What second messenger is involved in the binding of myosin to actin in skeletal muscle and cardiac muscle
- A.
  
  Calcium
- B.
  
  Tropomyosin
- C.
  
  Troponin c
- D.
  
  Myosin
- E.
  
  ATP
9.

When is ATP initially used in the crossbridge cycle?
- A.
  
  In rigor mortis
- B.
  
  In relaxation
- C.
  
  In excitation
- D.
  
  In hydrolysis
- E.
  
  In product release
10.

What is the most efficient method of ATP generation?
- A.
  
  Glycolysis
- B.
  
  Phosphorylation
- C.
  
  Gluconeogenesis
- D.
  
  Oxidation of fatty acids
- E.
  
  Chemiosmosis
11.

A muscle showing to have a slow myosin isoenzyme (ATPase rate)/contraction timemoderate Sr pump capacitymoderate diffusion diametersmall motor neuron sizehigh oxidative capacity:mt content, capillary density,myoglobin contenthigh fatigue resistancemoderate glycolytic capacitylow forceaerobic activitytriglycerides as storage fuelis what type?
- A.
  
  Type 11B/ fg/ ft-b/fast glycolytic/white
- B.
  
  Type 11A/fog/ft-a/fast oxidative/red
- C.
  
  Type 1/so/slow oxidative/white
- D.
  
  Type 1A/fog/ft-a/fast oxidative/red
- E.
  
  Type 2/so/slow oxidative/white
12.

A muscle showing to have a very fast myosin isoenzyme (ATPase rate)/contraction timehigh Sr pump capacityhigh diffusion diametervery large motor neuron sizelow oxidative capacity:mt content, capillary density,myoglobin contentlow fatigue resistancehigh glycolytic capacityvery high forceshort term aerobic activitycp,O2 as storage fuelis what type?
- A.
  
  Type 11B/ fg/ ft-b/fast glycolytic/white
- B.
  
  Type 11A/fog/ft-a/fast oxidative/red
- C.
  
  Type 1/so/slow oxidative/white
- D.
  
  Type 1A/fog/ft-a/fast oxidative/red
- E.
  
  Type 2/so/slow oxidative/white
13.

A muscle showing to have a fast myosin isoenzyme (ATPase rate)/contraction timehigh Sr pump capacitysmall diffusion diameter large motor neuron sizevery high oxidative capacity:mt content, capillary density,myoglobin contentmedium fatigue resistancehigh glycolytic capacityv high forcelong term aerobic activitycp,O2 as storage fuelis what type?
- A.
  
  Type 11B/ fg/ ft-b/fast glycolytic/white
- B.
  
  Type 11A/fog/ft-a/fast oxidative/red
- C.
  
  Type 1/so/slow oxidative/white
- D.
  
  Type 1A/fog/ft-a/fast oxidative/red
- E.
  
  Type 2/so/slow oxidative/white
14.

After a muscle relaxes and the compression of the vessels are relieved there is a sustained increase in blood flow. This is called?
- A.
  
  Hypertrophy
- B.
  
  Hypoxia
- C.
  
  Maximal voluntary contraction
- D.
  
  Reactive hyperemia
- E.
  
  Hyporemia
15.

Energy expenditure that is greater than oxidative resupply of enegy during exercise is called:
- A.
  
  Oxygen deficit
- B.
  
  Oxygen debt
- C.
  
  Hypoxia
- D.
  
  Hyperemia
- E.
  
  Oxygen depletion
16.

Which motor units are recruited first?
- A.
  
  Small
- B.
  
  Type 2
- C.
  
  Medium
- D.
  
  Type 1
- E.
  
  Large
17.

Which is not a primary cause of cellular fatigue in the muscle cell?
- A.
  
  Increased intracellular ADP
- B.
  
  Metabolic waste- lactic acid and phosphate
- C.
  
  Slowed type 2 motor units
- D.
  
  Depletion of ACh
- E.
  
  Increased intracellular potassium