Skeletal Muscles and Muscular Contraction
Muscle anatomy, types of muscle contractions, and mechanisms of skeletal muscle contraction
Questions
Which muscle works antagonistically to masseter?
- Deltoid
- Biceps
- Depressor mendibularis
- Sphincter
Which type of muscle reduces the angle of joint between two bones?
- Extensors
- Flexors
- Elevator
- Adductor
Which pair of muscles brings a body part or bone towards or away from median line?
- Flexors-Extensors
- Abductors-Adductors
- Elevator-Depressor
- Constrictor-Dilator
What is the thick part of muscle between the two ends called?
- Insertion
- Origin
- Belly
- Extensor
Which element is necessary for contraction of muscles?
- Phosphorous
- Calcium
- Oxygen
- Carbon
White muscle fibers get fatigued very fast due to accumulation of
- CO2
- lactic acid
- O2
- acetic acid
What is a sustained contraction of muscle due to the fusion of many twitches following each other in rapid succession called?
- Fatigue
- Tetanic contraction
- Concentric contraction
- Rigor mortis
Which of the following movements takes place by concentric contraction?
- Attempting to move a weight too heavy for the muscle to lift
- Bending of arm at elbow as the hand moves towards shoulder
- Muscles of the hand and forearm while gripping an object
- Propelling of body by muscles of legs during walking
Which type of contraction will the muscles of the arm and hands holding an object show?
- Isotonic contraction
- Isometric contraction
- Isovelocity contraction
- Eccentric contraction
Ca ions bind to _______ after release from sarcoplasmic reticulum.
- actin
- myosin
- troponin
- myoglobin
Sliding filament theory explains the mechanism of
- formation of muscles
- contraction of skeletal muscles
- respiration
- locomotion in snakes
Actinomycin is responsible for
- reconversion of ADP into ATP
- release of Ca ions
- muscle contraction
- reformation of ATP
Which neural hormone stimulates the muscle for contraction?
- Epinephrine
- Acetylcholine
- Dopamine
- Nor-epinephrine
The temporary rigidity of muscles after death is called
- tetany
- rigor mortis
- summation
- fatigue
Due to _______, red muscle fibers do not get fatigued soon.
- haemoglobin
- myoglobin
- troponin
- actin