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4physiology
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Questions in this quiz (30)
1 SC. Which of the following statements about cholinesterase is correct?
- Ait speeds up the release of acetylcholine from presynaptic terminal;
- Bit breaks down acetylcholine in synaptic cleft;
- Cit increases the concentration of acetylcholine in synaptic cleft;
- Dit prevents the combination of acetylcholine to acetylcholine receptors;
- Eit is involved in acetylcholine synthesis;
2SC Which of the following statements about curariform drugs is correct?
- Athey block the release of acetylcholine through presynaptic membrane;
- Bthey break down the acetylcholine;
- Cthe block the acetylcholine receptors on the postsynaptic membrane
- Dthey stop the synthesis of acetylcholine in the axon terminal;
- Ethey block the movement of acetylcholine molecules in synaptic cleft;
3SC. The transmission of AP in nervous fibers can be blocked reversibly by:
a) nerve ligature;- Acontact with hot object;
- Btetrodotoxin;
- Clidocaine
- Datropine
4 SC. What is conduction velocity in A-alpha fibers?
- A40-70 m/s
- B70-120 m/s;
- C15-40 m/s;
- D3-18 m/s;
- E5-15 m/s
5 SC. What is conduction velocity in C fibers?
- A4-8 m/s;
- B0.5-2 m/s;
- C15-40 m/s;
- D3-18 m/s;
- E5-15 m/s;
6SC. What is conduction velocity in A-beta fibers?
- A40-70 m/s;
- B70-120 m/s;
- C15-40 m/s;
- D3-18 m/s;
- E5-15 m/s;
7SC. What is conduction velocity in B fibers?
- A40-70 m/s
- B3-15 m/s
- C15-40 m/s
- D4-8 m/s;
- E0.5-2 m/s;
8SC. What is conduction velocity in A-gamma fibers?
- A40-70 m/s;
- B5-15 m/s;
- C3-18 m/s;
- D15-40 m/s;
- E70-120 m/s;
9 SC. What is conduction velocity in A-delta fibers?
- Athe conduction velocity through A-delta fibers is 40-70 m/s;
- Bthe conduction velocity through A-delta fibers is 70-120 m/s;
- Cthe conduction velocity through A-delta fibers is 15-40 m/s;
- Dthe conduction velocity through A-delta fibers is 0.5-2 m/s;
- Ethe conduction velocity through A-delta fibers is 5-15 m/s;
10SC. What is the function of B fibers?
- Athey are afferent fibers from touch receptors
- Bthey are afferent fibers from muscle receptors;
- Cthey are efferent fibers to muscle spindles
- Dthey are autonomic preganglionic fibers
- Ethey are autonomic postganglionic fibers
11 SC. Which of the following statements is NOT correct:
- Atransmission through chemical synapse is unilateral,
- Bthere is synaptic delay in chemical synapse;
- Cthe value of postsynaptic potential is directly related to quantity of released
neurotransmitter; - DCa2+ ions are important for neurotransmitter releasing from presynaptic ending;
- Epostsynaptic potential obeys the law "all or none";
12C. Which of the following statements is correct:
- Amonoamine oxidase breaks down acetylcholine
- Bcholinesterase breaks down acetylcholine;
- Ccatechol-O-methyltransferase breaks down acetylcholine;
- Depinephrine breaks down acetylcholine;
- Esuccinate dehydrogenase breaks down acetylcholine
13SC. Curare causes death via
- Aparalysis of respiratory muscles;
- Bmuscle tetanus;
- Cheart stop;
- Dcerebral edema;
- Eintraabdominal hemorrhage
14SC. Which is neurotransmitter in the neuromuscular junction?
- Aepinephrine
- Bnorepinephrine
- Cacetylcholine
- Dserotonin
- Edopamine
15SC. Which channels can be found on postsynaptic membrane?
- ANa+ voltage-gated channels;
- BK+ voltage-gated channels
- CCa2+ voltage-gated channels;
- Dligand-gated channels;
- ECl- voltage-gated channels
16SC. Which substance is the cell membrane most permeable for?
- Aglucose
- Bwater
- CCl
- DK
- ENa
17SC. The repolarization of the cell membrane during action potential is due to:
- ACl- influx
- BK+ influx;
- CNa+ outflow;
- DNa+ influx;
- EK+ outflow;
18SC. Which ions are most responsible for resting membrane potential?
- AK+
- BNa+
- CCl-
- Danions
- ECa2+;
19SC. When does acute local potential take place?
- Aif stimulus has over threshold intensity;
- Bif stimulus has under threshold intensity;
- Cif stimulus has threshold intensity;
- Dif stimulus has double threshold intensity
- Eif stimulus has triple threshold intensity;
20SC. What process causes hyperpolarization?
- ANa+ inflow;
- BNa+ outflow;
- CCa+ outflow;
- DK+ outflow;
- ECa+ inflow;
21SC. Which of the following statements about muscle fatigue is correct?
- Aconcentration of Ca++ in muscles decreases;
- Bconcentration of lactic acid in muscles decreases;
- Cconcentration of lactic acid in muscles increases;
- Dconcentration of pyruvic acid in muscles increases
- Econcentration of phosphocreatine in muscles increases
22 SC. Which ions are responsible for excitation-contraction coupling?
- AMg2+ ions;
- BNa+ ions;
- CCl- ions
- DCa2+ ions;
- EH+ ions;
23 MC. Cooling the nerve will cause:
- Adecreased threshold;
- Bincreased rate of AP;
- Chigher excitability;
- Dlower excitability;
- Eincreased threshold
24SC. Which of the following statements about myosin head is correct?
- Ait binds troponin C
- Bit binds troponin T
- Cit splits ATP
- Dit binds troponin I;
- Eit binds Ca++
25SC. What is the function of calsequestrin?
- Adecreases Ca2+ storage in sarcoplasmic reticulum
- Bincreases permeability of the sarcoplasmic reticulum membrane for Cl- ions;
- Cdecreases permeability of the sarcoplasmic reticulum membrane for K+ ions;
- Dincreases permeability of the sarcoplasmic reticulum membrane for K+ ions;
- Eincreases Ca2+ storage in sarcoplasmic reticulum;
26 MC. Which of the following statements about filaments of myofibrils are
correct?- Amyosin is a protein from thick filaments of the myofibril;
- Bmyoglobin is a protein from thick filaments of the myofibril;
- Cactin is a protein from thin filaments of the myofibril;
- Dtropomyosin is a protein from thin filaments of the myofibril;
- Ecreatine is a protein from thin filaments of the myofibril;
27MC. Skeletal muscle can change the force of contraction
- Aby changing the amplitude of action potential;
- Bskeletal muscle always has the same force of contraction
- Cby changing the duration of action potential
- Dby changing the number of active motor units
- Eby changing the rate of impulses from motor neurons;
28 MC. What is the role of Ca2+ in contraction of muscle?
- Ato couple excitation and contraction
- Bto maintain the contraction;
- Cto prevent the contraction;
- Dto release the energy for contraction;
- Eto stop the contraction;
29 MC. Which of the following statements is correct:
- Athe internal side of the cell membrane has + charge in resting;
- Bthe external side of the cell membrane has - charge in resting;
- Che cell membrane has no charge in resting
- Dthe internal side of the cell membrane has - charge in resting;
- Ethe external side of the cell membrane has + charge in resting;
30MC. Which of the following statements about action potential are correct?
- Aaction potential follows the principle "all-or nothing"
- Baction potential can vary according to the strength of the stimulus
- Caction potential travels alongside the cell membrane without decay in value
- Daction potential can summate
- Eaction potential travels alongside the cell membrane with decay in value;
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- Quiz on 4physiology, created by Anastasia Goncearuc on 01/06/2025.
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- Anastasia Goncearuc
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