The LMM of muscle fiber is

  • Tail

  • Head

  • Short arm

  • Both 1 and 3

The head part of the HMM of muscle fiber is

  • Globular

  • Triangular

  • Filamentous

  • Both 2 and 3

The globular head is/has

  • An active ATPase enzyme

  • Binding sites for ATP

  • active sites for actin

  • All of these

Sliding Filament Theory states that

  • Contraction of muscle fibre takes place by the sliding of thin filaments over the thick filaments

  • Contraction of muscle fibre takes place by the sliding of thick filament over thin Filaments

  • Relaxation of muscle fibre takes place by the sliding of thick filament over thin filaments

  • Relaxation of muscle fibre takes place by the sliding of thin filament over thick filament

The motor unit actually has

  • Motor neuron

  • Motor neuron+ muscle fibres

  • Only muscle fibres

  • It can be both 2 and 3

Muscle Contraction is initiated by

  • A signal sent by CNS via a motor neuron

  • A signal sent by PNS via a motor neuron

  • A signal sent by ANS via efferent neuro

  • A signal sent by ANS via efferent neuron

Neuromuscular junction or motor endplate is

  • The junction between a motor neuron and the sarcolemma of the muscle fiber

  • The junction between a motor neuron and sensory neuron

  • The junction between the sensory neuron and the sarcolemma of the muscle fibre

  • Both 1 and 3

A neural signal reaching this junction releases a neurotransmitter…………. Which generates an action potential in the ………..

  • Acetyl choline, Sarcolemma

  • Inositol, Sarcolemma

  • GABA, Sarcoplasmic reticulum

  • GABA, Sarcoplasm

The calcium ions released in sarcoplasm will bind to

  • Tropomyosin

  • Troponin

  • Actin

  • Meromyosin

The binding of troponin on actin Filaments actually masks the …..

  • Active site for Tropomyosin

  • Active site for ATP

  • Active site for Myosin

  • Active site for troponin

The binding of calcium to troponin actually indicates

  • Unmasking of Myosin binding site over meromyosin

  • Unmasking of Myosin binding site over actin

  • Unmasking of the actin-binding site over Myosin

  • Unmasking of actin-binding site over tropomyosin

…………… projects outwards at regular …….. from each other from the surface of polymerized Myosin Filaments and is also known as …….

  • Head and short arm, angle, cross arm

  • Head and short arm, distance, cross arm

  • Both 1 and 2

  • Head and short arm, distance, LMM

The cross-bridge formation actually involves

  • ATP hydrolysis

  • Binding of Myosin head to the exposed active sites for myosin

  • Both A and B

  • None of these

During contraction of muscle fibers which of the following does not happen?

  • The length of the A band gets reduced

  • The attached actin Filaments are pulled towards the centre of A band

  • The Z line attached to actin Filaments is pulled inward

  • Shortening of sarcomere

Which of the following step during sliding Filament Theory is the last step before a relaxing state?

  • ATP utilization

  • Release of ADP and inorganic phosphate

  • Cross bridge formation

  • Binding of calcium with troponin

Which of the following statements is incorrect?

  • A new ATP binds and cross-bridge is broken with the next cycle of contraction

  • The process of contraction continues till the calcium ions are pumped back to the sarcoplasmic cisternae and resulting in the unmasking of actin Filaments

  • The reaction time of the fibres can vary in different muscles

  • Both 1 and 3

Repeated activation of the muscles can lead to

  • Accumulation of pyruvate due to anaerobic breakdown of glycogen

  • Accumulation of lactic acid due to anaerobic breakdown of glycogen

  • Fatigue

  • Both 2 and 3

Which of the following property cannot be attributed to white fibers?

  • Fewer mitochondria

  • Anaerobic process for energy

  • Sarcoplasmic reticulum is high

  • More quantity of myoglobin

Which of the following is wrong with respect to Human skeleton?

  • Humans- 206 bones

  • Axial skeleton- 80 bones

  • Skull-24 bones

  • Ear ossicles- 6

The human skull does not include which of the following bones?

  • Ethmoid bone

  • Sphenoid bone

  • Lacrimal bone

  • Scapular bone

Axial skeleton does not include

  • Skull

  • Vertebral Coulmn

  • Sternum

  • Radial bones

Which of the following is not a cranial bone in human?

  • Temporal bone

  • Occipital bone

  • Parietal bone

  • Zygomatic bone

Which of the following is not a facial bone?

  • Maxilla

  • Mandible

  • Zygomatic bone

  • Parietal bone

How many facial bones are included in skull?

  • 14

  • 8

  • 22

  • 15

Which of the following facial bone is unpaired?

  • Mandible

  • Maxilla

  • Zygomatic bone

  • Lacrimal bone

When we describe skull bones to be 22, which of the following is not included in skull bones?

  • Cranial bones

  • Lacrimal bones

  • Zygomatic bones

  • Ear ossicles

How many ear ossicles are there in humans?

  • 6

  • 8

  • 4

  • 12

Facial bones+cranial bones+Hyoid bone+Ear Ossicles, Which of the following is showing the correct number?

  • 22

  • 29

  • 14

  • 25

Which of the following is a cranial bone and is single?

(2) Temporal bone

  • Parietal bone

  • (4) Both 2 and 3

  • Sphenoid bone

  • 4

Which of the following is a cranial bone and is not single in number?

  • Parietal bone

  • Temporal bone

  • Ethmoid bone

  • Both 1 and 2

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