22) In skeletal muscles , all the following is true except :
Anonymous Quiz
13%
a ) Tropomyosin is found in the thin filaments
7%
b ) Myosin is found in the thick filaments .
24%
c ) The lateral sacs of sarcoplasmic reticulum are rich in Ca ++
56%
d ) Troponin C molecules bind Ca ++ Energy from ATP is not required for muscle relaxation .
Which one of the following factors increase the excitability of skeletal muscles
Anonymous Quiz
29%
High calcium ion concentration in the extracellular fluid.
60%
Low calcium ion concentration in the extracellular fluid
6%
Neuromuscular blockers.
4%
Local anathetic drags
Which one of the following factors decrease the excitability of skeletal muscles
Anonymous Quiz
57%
High calcium ion concentration in the extracellular fluid.
33%
Low calcium ion concentration in the extracellular fluid
2%
Anticholinestrase enzyme
8%
Cholinomimetic drugs
Which one of the following factors would increase the mechanical efficiency of the muscle
Anonymous Quiz
7%
Excessive cooling of the muscle.
20%
Muscle fatigue.
61%
Training.
13%
Isometric contraction.
Which one of the following factors would decrease the mechanical efficiency of the muscle
Anonymous Quiz
12%
When carbohydrates is the main source of energy.
75%
Muscle fatigue.
7%
Training.
5%
Isotonic contraction.
Low calcium ion concentration in the extracellular fluid increase the excitability of muscle cells due to
Anonymous Quiz
18%
Hyperpolarization of muscle cells
45%
Increase the membrane permeability to sodium
20%
Increase the membrane permeability to potassium
18%
Increased duration of action potentials
Increases excitability of muscle cells is due to:
Anonymous Quiz
44%
High extracellular calcium
40%
low extracellular calcium
10%
spinal anesthesia
6%
low extracellular potassium
ุฃุณุฆูุฉ ูุณููููุฌู ุนูู ุงู skeletal muscles
ููุงูุนุงุฏุฉ ูุง ุณุงุฏุฉ ๐
ุงูุณุคุงู ุงููู ู ุด ุชุจุนู ุงุนู ูู skip
ูุงูุณุคุงู ุงููู ู ุงุชููู ููุด ุฃู ุนูุฏู ุงุนุชุฑุงุถ ู ุฅุฌุงุจุชู
ุชูุฏุฑ ุชููุฑูุง ู ุงูุจูุช ุจุชุงุนูุง๐ซถ
(@Physical_Therapy_TBot)
ุฃุชู ูู ุชุฏุนูููุง ูุง ุดุจุงุจ ุนูุดุงู ุงูุญุงูุฉ ุตุนุจุฉ ูุงููู ๐ฅฒ๐
ูุจุงูุชูููู ููุฌู ูุน๐ฉท
ููุงูุนุงุฏุฉ ูุง ุณุงุฏุฉ ๐
ุงูุณุคุงู ุงููู ู ุด ุชุจุนู ุงุนู ูู skip
ูุงูุณุคุงู ุงููู ู ุงุชููู ููุด ุฃู ุนูุฏู ุงุนุชุฑุงุถ ู ุฅุฌุงุจุชู
ุชูุฏุฑ ุชููุฑูุง ู ุงูุจูุช ุจุชุงุนูุง๐ซถ
(@Physical_Therapy_TBot)
ุฃุชู ูู ุชุฏุนูููุง ูุง ุดุจุงุจ ุนูุดุงู ุงูุญุงูุฉ ุตุนุจุฉ ูุงููู ๐ฅฒ๐
ูุจุงูุชูููู ููุฌู ูุน๐ฉท
๐ฅฐ4๐2
ุฅูู ุฑุฃูู ูุนู
ู ู
ุนุณูุฑุงุช ู
ุฐุงูุฑุฉ ููู
ุจููู
ุงูู
ููุฌุ
Anonymous Poll
90%
ุชู
ุงู
ู
ุนุงู.
10%
ูุง.
ูู ุฃู
ูู ูุง ุดุจุงุจ ุงููู ุจูุงุฎุฏ professional behaviour ูู ุฌุงู
ุนุชู ูู
ุนุงู ุฃุณุฆูุฉ ูููุง
ูุจุนุช ุน ุงูุจูุช:
@Physical_Therapy_TBot
ูุจุนุช ุน ุงูุจูุช:
@Physical_Therapy_TBot
โค1
Physiology Magdy Sabry Respiratory.pdf
13.1 MB
Respiratory
Physiology Magdy Sabry Special Senses.pdf
10.8 MB
Special Senses
โค2
โช Physiology - Dr. Magdy Sabry
๐ฟ Topics: CVS, Blood, Special senses, Endocrine, GIT, Respiratory and ANS.
-> Channel
๐ฟ Topics: CVS, Blood, Special senses, Endocrine, GIT, Respiratory and ANS.
-> Channel
๐1
Physiology MCQs Book.pdf
29.3 MB
โช MCQs on PHYSIO
Important notes on physiology (written)
Enumerate :
- Function of Tropomyosin ?
In the resting state, the tropomyosin molecules cover the active sites of the actin strands, preventing attraction between the actin and myosin filaments .
- Function of T-tubular ?
conduct the action potential from the surface of the muscle to the
muscle fibrils inside.
- Factors affecting neuromuscular transmission:
1. Calcium: facilitates but Mg inhibits neuromuscular transmission.
2. Hypoxia: decrease neuromuscular transmission.
3. Hypoglycaemia: decrease neuromuscular transmission.
4. Drugs:
Anti-choline estrases : facilitate neuromuscular transmission.
Curare: bind with Ach receptors blocking them โ inhibit transmission.
Succinyl-choline: initial stimulation of neuromuscular transmission then blocking by producing sustained state of depolarization.
Botulinum toxin: inhibit Ach release inhibit transmission.
- Properties of neuromuscular transmission ?
1) Unidirectional: from the nerve to the muscle not the reverse.
2) Delay: of about 0.5 msec. which is the time needed for the release of acetylcholine until the generation of action potential.
3) Easily fatigued: when depletion of the transmitter takes place.
4) Blocked by curare.
5) Mg prevents the release of the transmitter at the MEPโ decrease the neuromuscular transmission.
Complete :
- Muscle contraction occurs by ......sliding myosin over actin
- The structural unit of the muscle is the............
Muscle cell (fibrer)
- True or false , muscle contraction occurs by sliding myosin over actin
False
Actin over myosin
-Ca-calmodulin complex is a second messanger
- True or false Unidirectional is from muscle to nerve
Falseโก๏ธfrom nerve to muscle
- In neuromuscular transmission delay is happened by0.5msec
- The Easily fatigue isthe neuromuscular junction
Enumerate :
- Function of Tropomyosin ?
In the resting state, the tropomyosin molecules cover the active sites of the actin strands, preventing attraction between the actin and myosin filaments .
- Function of T-tubular ?
conduct the action potential from the surface of the muscle to the
muscle fibrils inside.
- Factors affecting neuromuscular transmission:
1. Calcium: facilitates but Mg inhibits neuromuscular transmission.
2. Hypoxia: decrease neuromuscular transmission.
3. Hypoglycaemia: decrease neuromuscular transmission.
4. Drugs:
Anti-choline estrases : facilitate neuromuscular transmission.
Curare: bind with Ach receptors blocking them โ inhibit transmission.
Succinyl-choline: initial stimulation of neuromuscular transmission then blocking by producing sustained state of depolarization.
Botulinum toxin: inhibit Ach release inhibit transmission.
- Properties of neuromuscular transmission ?
1) Unidirectional: from the nerve to the muscle not the reverse.
2) Delay: of about 0.5 msec. which is the time needed for the release of acetylcholine until the generation of action potential.
3) Easily fatigued: when depletion of the transmitter takes place.
4) Blocked by curare.
5) Mg prevents the release of the transmitter at the MEPโ decrease the neuromuscular transmission.
Complete :
- Muscle contraction occurs by ......
- The structural unit of the muscle is the............
- True or false , muscle contraction occurs by sliding myosin over actin
Actin over myosin
-
- True or false Unidirectional is from muscle to nerve
- In neuromuscular transmission delay is happened by
- The Easily fatigue is
๐2