Locomotion and Movement - Online Test
Q1. Look at the following figure of myofibrils
figure (1), (2), (3), (4) : showing ?
figure (1), (2), (3), (4) : showing ?
Answer : Option D
Explaination / Solution:
Myofibrils are present in muscles fibers which are parallelly arranged filaments in sarcoplasm. Figure 1 and 2 present relaxed state while figure 3 and 4 represents cross bridge formation.
Q2. Look at the following figure of movement of the thin filaments
The label x, y, and z are respectively
The label x, y, and z are respectively
Answer : Option A
Explaination / Solution:
The label x is H-zone, y is I band and z is A band.
Q3. The correct result of ATPase activity that occurs during muscle contraction is :
Answer : Option A
Explaination / Solution:
ATPase enzyme acts on myosin to act on ATP to convert into ADP. The activated myosin combine with actin for contraction.
Q4. Read the following statements about muscle contraction in humans :
i. chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter.
ii. a neurotransmitter acetylcholine at motor end plate converts electrical energy into mechanical energy.
iii. in a contracted muscle, volume remains the same.
iv. a contracted muscle becomes shorter and thicker.
i. chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter.
ii. a neurotransmitter acetylcholine at motor end plate converts electrical energy into mechanical energy.
iii. in a contracted muscle, volume remains the same.
iv. a contracted muscle becomes shorter and thicker.
Answer : Option A
Explaination / Solution:
The chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter. In a contracted muscle, volume remains the same and a contracted muscle becomes shorter and thicker.
Q5. Which of the following statements is/are incorrect about sliding filament theory of muscle contraction?
Answer : Option B
Explaination / Solution:
During contraction, the ‘I’ bands get reduced, whereas the ‘A’ bands retain the length.
Q6. What do the following figure represent in (i),(ii) and (iii) ?
Answer : Option D
Explaination / Solution:
Figure represents muscle fibres marked
i. as M-line,
ii as actomyosin myofilaments and
iii. Represents Z-line.
Q7.
From the following figure infer :
(a) = ?, (b) = ? and (c) = ?
Answer : Option A
Explaination / Solution:
Myograms is diagnostic test of health and functionality of a person’s muscle. In the given myograms,
a. shows staircase effect,
b. shows summation and
c. shows tetanus that leads to fatigue.
Q8. Myoglobin was the first protein to have its three-dimensional structure revealed. Ravi was diagnosed with myoglobin in his bloodstream. This had occurred due to :
Answer : Option C
Explaination / Solution:
Myoglobin is an iron and oxygen binding protein found in the muscle tissue of mammals. Presence of myoglobin in blood stream may be due to muscle injury of Ravi due to accident or sudden jerk.
Q9. The vertebral formula of human is :
Answer : Option A
Explaination / Solution:
The vertebral column is differentiated into cervical (7), thoracic (12), lumbar (5), sacral (5-fused) and coccygeal (4-fused) regions starting from the skull.
Q10. At the base of skull, a large hole is present which allows brain to continue with the spinal cord. That hole is called :
Answer : Option D
Explaination / Solution:
Foramen Magnum is the largest foramen situated on the base of the skull through which multiple structures pass including the Spinal Cord. It acts as a passage between the cranial vault and the base of the skull.
