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Locomotion & Movement: MCQ Test

Test your knowledge of human locomotion, muscle contraction, and skeletal system with these multiple-choice questions.

Test Your Knowledge

Showing questions 21 - 40 of 201

21. During walking, talus passes/transmits about the half of the weight of body to

Cuneiform
Cuboid
Calcaneum
Navicular

The talus articulates with the tibia and fibula to form the ankle joint and transmits a significant portion of the body's weight downwards. This weight is primarily supported and distributed by the calcaneum (heel bone), which is the largest and strongest tarsal bone.

22. A cricket player is fast chasing a ball in the field. Which one of the following groups of bones are directly contributing in this movement?

Femur, malleus, tibia, metatarsals
Tarsals, femur, metatarsals, tibia
Pelvis, ulna, patella, tarsals
Sternum, femur, tibia, fibula

Fast chasing a ball primarily involves the lower limbs. The tarsals (ankle bones), femur (thigh bone), metatarsals (foot bones), and tibia (shin bone) are all integral bones of the lower limb skeleton directly involved in running, propulsion, and weight-bearing activities. Bones like malleus (ear ossicle), ulna (forearm), and sternum (chest) are not directly involved in leg movement.

23. Type of movement shown by Paramoecium is

Amoeboid
Ciliary
Flagellar
Muscular

Ciliary movement is characteristic of organisms like Paramoecium, where the coordinated beating of numerous short, hair-like cilia propels the organism and aids in feeding.

24. Which of the following can be taken as a character of skeletal muscle fibre?

Excitability
Extensibility
Contractibility
All of these

Skeletal muscle fibers possess all these characteristics: excitability (ability to respond to stimuli and generate action potentials), extensibility (ability to be stretched), and contractibility (ability to shorten and exert force). These properties enable their diverse functions.

25. Each fasciculus of skeletal muscle fibre is surrounded by

Epimycium
Perimycium
Endomycium
Sarcolemma

A fasciculus, which is a bundle of muscle fibers, is enclosed by a connective tissue covering called the perimysium.

26. Select the true statement

A band is present in the middle of sarcomere
H zone is present in the middle of A - band
M line is present in the middle of H - zone
All of these

All the given statements accurately describe the organization of a sarcomere: The A band is a dark region located in the middle of the sarcomere. Within the A band, there's a lighter region called the H zone. And the M line is found in the very center of the H zone, serving as an anchor for the thick filaments [information not from source, but consistent with general sarcomere structure].

27. One myosin filament in the myofibril of skeletal muscle fibre is surrounded by how many actin filaments?

Too
Four
Six
Eight

In the ultra-structure of a skeletal muscle fiber, each thicker myosin myofilament is surrounded by six thinner actin myofilaments.

28. Functional unit of a muscle fibre is

Thick filament
Sarcomere
Thin filament
Myofibrils

The sarcomere is clearly identified as the functional contractile unit of a myofibril, encompassing the region between two consecutive Z lines.

29. Which of the following is the regulatory muscle protein having double chain structure?

Troponin
Actin
Myosin
Tropomyosin

Tropomyosin is a regulatory protein that, along with troponin, is associated with the actin filaments. It acts to block the myosin-binding sites on actin in a relaxed muscle, thus regulating contraction. While the double-chain structure is a characteristic feature of tropomyosin, its regulatory role is emphasized in the source.

30. During muscle conl raction in a skeletal muscle fibre, Ca2+ combine with

TpT
TpC
Tpl
Tropomyosin

During muscle contraction, calcium ions (Ca2+) are released into the sarcoplasm and specifically bind to the TpC unit (calcium binding protein) of the troponin complex, initiating the conformational changes required for contraction.

31. A specific minimum strength of nerve impulse of some artificial stimulus required for exciting a muscle fibre to contract is called

All or none rule
Tetanus
Threshold stimulus
Fatigue

The threshold stimulus refers to the minimum intensity of a stimulus (like a nerve impulse) that is required to trigger an action potential in a muscle fiber and initiate a contractile response.

32. Time taken by a single muscle twitch is

1 second
0.1 second
10 seconds
2 seconds

A single muscle twitch, which is a brief contraction-relaxation cycle of a muscle fiber in response to a single stimulus, typically occurs in a very short duration, approximately 0.1 seconds [information not from source, but common physiological knowledge].

33. The contraction of muscle of shortest duration is seen in

Jaws
Eye lids
Heart
Intestine

Muscles responsible for extremely rapid and brief movements, such as those controlling the eyelids for blinking, exhibit the shortest contraction durations [information not from source].

34. The time period between the beginning of electrical response and peak of tension recorded is

Contraction time
Latent period
Refractory period
Relaxation time

The contraction time is the phase of a muscle twitch that spans from the onset of the electrical response (action potential) to the point of maximal tension development. This is when the sliding filament mechanism actively shortens the sarcomeres.

35. The muscle fatigue occurs due to accumulation of

CO2
Lactic acid
Creatine phosphate
Myosin ATPase

During strenuous exercise, particularly when oxygen supply is insufficient (anaerobic conditions), muscle fatigue occurs largely due to the accumulation of lactic acid within the muscle fibers.

36. In a contracted skeletal muscle fibre

M line disappears
H·zone elongates
I-band remains constant
A-band disappears

During maximal muscle contraction, according to the sliding filament mechanism, the H-line and M-line disappear, and the I-band almost disappears as the thin filaments slide inwards. However, the A-band (representing the length of the thick filaments) remains constant.

37. One of the following ions is essential for muscular contraction

Na+, Ca++
Mg++, Ca++
Mg++, K+
K+, Na+

Calcium ions (Ca2+) are explicitly essential for initiating muscle contraction by binding to troponin. While not explicitly stated in the source, Magnesium ions (Mg2+) are crucial cofactors for myosin ATPase, the enzyme that hydrolyzes ATP to power the contraction [22, and information not from source].

38. The potential difference across the membrane of a relaxed muscle fibre is called resting potential. II amounts to about

-70 mV
50 mV
100mV
50-100 mV

The resting membrane potential of a relaxed muscle fiber, which is a state of electrical potential difference across its plasma membrane, is typically around -70 mV [information not from source, but common physiological knowledge].

39. The longest individual muscle in the human body is

Quadriceps femoris
Gluteus maxim us
Sartorius
Latissimus dorsi

The Sartorius muscle, which runs diagonally down the length of the thigh, holds the distinction of being the longest individual muscle in the human body [information not from source].

40. In one of the following functions white muscles are not used

Moving of eye balls
Fast and strenuous work for short duration
For sustained work at a slow rate for a prolonged duration
Fast flights as in sparrows

White muscle fibers are specialized for rapid, strenuous, and short-duration activities (e.g., eye movements, fast flights in sparrows) due to their reliance on anaerobic metabolism and fast contraction rate. They fatigue quickly. In contrast, red muscle fibers are adapted for sustained work at a slow rate for prolonged durations using aerobic oxidation.

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Excretory Products & Their Elimination: MCQs

biology

class 11
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biology mcqs

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