Locomotion and Movement Test

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Locomotion and Movement Test - 10

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Question 1
1 / -0

EDTA injected into muscles combines with $$Ca^{2+}$$ and

A
Stops contraction

B
Causes contraction

C
Slows down contraction

D
None of the above
Solution
- Active sites for myosin are present on actin which are masked by troponin in resting state. When Ca++ level increases it leads to the binding of calcium with a subunit of troponin on actin(thin) filaments and thereby remove the masking of active sites for myosin.
- Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge.
- This pulls the attached actin filaments towards the centre of ‘A’ band.
- The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction.
- When EDTA injected into muscles combines with Ca ++ and prevents the binding of calcium with troponin and slows down contraction.
- So, the correct answer is 'Slows down contraction'.
Question 2
1 / -0

Taxis is movement in

A
Single cell

B
Single-celled organism

C
Cell organelles

D
All the above

Solution

Taxis is a kind of behavioural response of a cell, cell organelles or an organism to an external stimulus such as light or food. It is the orientation of an organism or a cell in a specific spatial relationship to a stimuli. If the movement is towards the stimuli it is positive taxis and if it is away from the stimuli it is negative taxis.
Thus, the correct answer is option D.
Question 3
1 / -0

Symptoms of tetanus include

A
Muscle cramps or spasms in your legs

B
Swollen neck

C
Bowed legs

D
All the above

Solution

Tetanus is caused by the bacterium Clostridium tetani (C tetani). It is a fatal disease of the nervous system caused by nerve toxins released by the bacterium.
Symptoms of tetanus include:
a)Tetanus often begins with mild spasms in the jaw muscles known as lockjaw. The spasms can also affect the facial muscles and experience spasms and stiffness in various muscles, especially those in jaw, abdomen, chest, back, and neck.
b)Muscle cramps or spasms in your legs.
c)Difficulty swallowing.
d)fever, high blood pressure, nervous system dysfunction, or sweating.
Hence symptoms of tetanus include Muscle cramps or spasms in your legs.
So, the correct option is 'Muscle cramps or spasms in your legs'.
Question 4
1 / -0

Synovial joints may be classified into subtypes according to

A
Shape

B
Amount of synovial fluid

C
Number of bones

D
Amount of cartilage

Solution

Based on the movement ability, fibrous and cartilaginous joints are functionally classified as a synarthrosis or amphiarthrosis, the synovial joints are classified on the basis of shape.
So, the correct option is 'Shape'.
Question 5
1 / -0

The value of resting membrane potential is

A
-90mV

B
-100mV

C
+100mV

D
+90mV

Solution

Each resting cell is in a polarized across its membrane called resting membrane potential. This potential average -70 mv (-60 to -90mv) on inner side of the membrane in respect to its outer side.
Question 6
1 / -0

End plate junction is present between

A
Neuron and striated muscle

B
Neuron and neuron

C
Muscle and muscle

D
Both B and C
Solution
- The area of contact between the ends of a large myelinated nerve fibre and a fibre of the skeletal muscle is called the motor endplate junction.
- It is also called a neuromuscular junction or myoneural junction.
Thus, the correct answer is option (A), 'Neuron and striated muscle'.
Question 7
1 / -0

Actin and myosin proteins are related with

A
$$Na^{+}$$ and $$K^{+}$$ pump

B
Muscle contraction

C
Nervous system

D
Excretion of water products

Solution

Actin filaments, usually in association with myosin, are responsible for many types of cell movements. Myosin is the prototype of a molecular motor-a protein, that converts chemical energy in the form of ATP to mechanical energy, thus generating force and movement. Such movement is muscle contraction.
Hence the correct option is B.
Question 8
1 / -0

A.A-bands of the muscle is dark and contain myosin.
B.I-bands are the light bands and contain actin.
C.During muscle contraction the A-band contracts.
D.The part between the two Z-lines is called as sarcomere.
E.The central part of thin filament, not overlapped by thick filament is called H-zone.
Which of the above statements are correct and which are incorrect?

A
A, B and C are correct, while D and E are incorrect.

B
A, C, E are correct, while B and D are incorrect.

C
A and B are correct, while C, D and E are incorrect.

D
A, B, C and E are correct, while D is incorrect.

E
A, B and D are correct, while C and E are incorrect.

Solution

Thick and thin filaments overrun which forms a dark bands called A bands. It consists of myosin. So, option A is correct.
Thin filaments alone form light bands, called as I bands and are formed of actin. So, option B is correct.
During muscle contraction sarcomeres shorten, the distance between Z-lines decreases - the width of the H and I-bands also decreases. So, option C is incorrect.
Two Z-lines delimit the unit of muscle contraction and is called the sarcomere. So, option D is correct.
The H band is within the A band where there is no overlap.
So, the correct answer is option E.
Question 9
1 / -0

Which one of the following is wrongly matched.

A
Myosin - Contractile protein

B
Tendon - Connective tissue

C
Smooth muscle - Involuntary muscle

D
Red muscle - Myoglobin

E
Troponin - Fibrous protein

Solution

Troponin are a group of proteins found in skeletal and heart muscle fibers that regulate muscle contraction. Troponin tests measure the level of cardiac-specific troponin in the blood to help detect heart injury.
So, option E is the correct option.
Question 10
1 / -0

In Myasthenia gravis, acetylcholine

A
Receptors on motor end plate are reduced

B
Secretion from nerve terminal is reduced

C
Esterase activity is inhibited

D
Secretion from nerve terminals is enhanced

Solution

Myasthenia gravis is a rare disease that is considered to be an autoimmune disorder in which skeletal muscles are affected and the patient feels weakness and rapid fatigue. Immune system accidentally produces antibodies which block the receptor of muscles for a neurotransmitter acetylcholine so the muscles receive very less nerve signals and the person feels weak. Hence receptors on motor end plate are reduced. Symptoms of myasthenia include trouble talking, tiredness, difficulty in breathing, facial paralysis, difficulty in swallowing or chewing.
So, the correct answer is 'Receptors on motor end plate are reduced'.

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Locomotion and Movement Test - 10

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Locomotion and Movement Test - 10

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Question 1

Stops contraction

Causes contraction

Slows down contraction

None of the above

Solution

Question 2

Single cell

Single-celled organism

Cell organelles

All the above

Solution

Question 3

Muscle cramps or spasms in your legs

Swollen neck

Bowed legs

All the above

Solution

Question 4

Shape

Amount of synovial fluid

Number of bones

Amount of cartilage

Solution

Question 5

-90mV

-100mV

+100mV

+90mV

Solution

Question 6

Neuron and striated muscle

Neuron and neuron

Muscle and muscle

Both B and C

Solution

Question 7

$$Na^{+}$$ and $$K^{+}$$ pump

Muscle contraction

Nervous system

Excretion of water products

Solution

Question 8

A, B and C are correct, while D and E are incorrect.

A, C, E are correct, while B and D are incorrect.

A and B are correct, while C, D and E are incorrect.

A, B, C and E are correct, while D is incorrect.

A, B and D are correct, while C and E are incorrect.

Solution

Question 9

Myosin - Contractile protein

Tendon - Connective tissue

Smooth muscle - Involuntary muscle

Red muscle - Myoglobin

Troponin - Fibrous protein

Solution

Question 10

Receptors on motor end plate are reduced

Secretion from nerve terminal is reduced

Esterase activity is inhibited

Secretion from nerve terminals is enhanced

Solution

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