Tag: skeleton and movements

Questions Related to skeleton and movements

The longest phase in a single muscle twitch in a vertebrate is about 50 millisec and is ................. phase.

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Latent

  2. Contraction

  3. Relaxation

  4. All are equal

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Correct Option: C
Explanation:

Muscle twitch is the response of a muscle to a single electrical stimulation. It is divided into three phases: latent period - time between stimulation and beginning of shortening, contraction phase - time of shortening, relaxation phase- time when muscle is returning to resting length (longest phase).

Rigor mortis is 

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Contraction of muscles after death

  2. Contraction of muscles before death

  3. Shivering of muscles

  4. None of the above

Show answer
Correct Option: A
Explanation:

Rigor mortis is stiffening of the body caused by contraction of muscles after death. In humans it occurs four hours after death. Due to absence of oxygen after death, the ATP is not formed which is required for separation of actin and myosin. When oxygen is no longer present, the body may continue to produce ATP via anaerobic glycolysis. When the body's glycogen is depleted, the ATP concentration diminishes, and the body enters rigor mortis because it is unable to break those bridges. So, the correct answer is 'Contraction of muscles after death'.

TLV' stands for

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Temperature limit value

  2. Threshold Limit Value

  3. Tropical limit value

  4. Time Limit value

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Correct Option: B

Exposure to $H _{2}S$ for a short period, causes

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Vomiting

  2. Mortality

  3. Fatigue

  4. Unconsciousness

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Correct Option: C

Contraction of shortest duration is of

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Heart

  2. Eyelids

  3. Arm

  4. Jaws

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Correct Option: B
Explanation:

The external muscles of the eye are conspicuously large and strong in relation to the small size and weight of the eyeball. It is frequently said that they are the strongest and fastest contracting muscles due to the constant blinking action they have to do. Eye movements do require high speed movements, and eye muscles are exercised continuously even during rapid eye movement of sleep. 

When supra maximal stimulus is given then

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Muscle contraction is more than normal

  2. Muscle contraction is less than normal

  3. Muscle contraction is below average

  4. None of the above

Show answer
Correct Option: A
Explanation:

At the maximal stimulus, all motor units are recruited. All muscle cells in the whole muscle are contracting. Any stimulus above the maximal stimulus is called a supramaximal stimulus (voltage) and the tension will not increase beyond that elicited by a maximal stimulus. Thus, the correct answer is option A.

Symptoms of tetanus include

zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

  1. Muscle cramps or spasms in your legs

  2. Swollen neck

  3. Bowed legs

  4. All the above

Show answer
Correct Option: A
Explanation:
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'.

Metabolic arthritis is commonly called

zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

  1. Rheumatism

  2. Gout

  3. Tuberculosis

  4. Cancer

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Correct Option: B

Sprain involves

zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

  1. Overstretching of ligament

  2. Overstretching of tendon

  3. Dislodging of bone

  4. Both A and B

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Correct Option: A
Explanation:

A sprain is a stretching or tearing of ligaments which are the tough bands of fibrous tissue that connect two bones together in the joints. The most common causes of sprains are falling, twisting etc. These types of injuries may cause the joint to move out of its normal range of movement that causes the tearing or stretching of the ligament. So, the correct answer is 'Overstretching of ligament'.

Sprain is due to outstretching/pulling of

zoology skeleton and movements disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

  1. Muscles

  2. Tendons

  3. Ligaments

  4. Nerves

Show answer
Correct Option: C
Explanation:

A sprain is a stretching or tearing of ligaments which are the tough bands of fibrous tissue that connect two bones together in the joints. A sprain results in an overstretch or tear of the ligaments supporting that joint. 

So, the correct answer is 'ligaments'.