Tag: muscles

Questions Related to muscles

Choose the correct answers from the alternatives given.
When out of oxygen, vertebrate muscle:

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. produces lactic acid

  2. produces more carbon dioxide

  3. stops functioning

  4. degrades protein

Show answer
Correct Option: A
Explanation:
The repeated contraction of the muscle results in the low concentration of oxygen and this anaerobic condition leads to the accumulation of lactic acid in the muscle. 
So, the correct option is 'produces lactic acid'

Extensor muscles of back have

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. An aerobic oxidation

  2. Fast rate of contraction

  3. Larger diameter muscle fibers

  4. Abundant in myoglobin

Show answer
Correct Option: A,D
Explanation:

Extensor muscles. Attached to the back of the spine, these muscles allow us to stand and lift objects. They include the large muscles in the lower back (erector spinae), which help hold up the spine, and gluteal muscles.

Extensor muscles are one of the examples for red muscles which contains abundant mitochondria and myoglobin. 
Red muscle fibres contract and fatigue more slowly than white fibres and generate ATP by aerobic catabolism of glucose and fats, utilizing myoglobin-bound O2
Myoglobin is abundant and great numbers of mitochondria occur, characterized by slow, sustained (tonic) contraction.
So, the correct answer is 'An aerobic oxidation and Abundant in myoglobin'

Smallest muscle in the human body

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. Sartorius

  2. Spinal muscle

  3. Stapes

  4. Stapedius

Show answer
Correct Option: D
Explanation:

The stapedius muscle, which is innervated by the facial nerve (cranial nerve VII), is the smallest of all skeletal muscles.

Largest muscle of human body is

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. Stapedium

  2. Quadriceps

  3. Gluteus maximus 

  4. Masseter

Show answer
Correct Option: C
Explanation:

The gluteus maximus is the largest muscle in the human body. These muscles help move the hips and thighs and also keep the trunk of the body in upright position. These muscles work against the gravity when we are walking up stairs. So, the correct answer is 'Gluteus maximus'.

Which of the following muscle types CNNOT be used valuntarily.

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. Both striated and smooth

  2. Both cardiac and striated

  3. Both smooth and cardiac

  4. Cardiac,striated and smooth

Show answer
Correct Option: C

The two muscles which help in thermoregulaton of the scrotum moving it up or down depending on outside temperature are

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. Gastrocnemius and Flexor longus

  2. Cremaster and Danos muscle

  3. Adductor longus and Abductor flexor

  4. Flexor longus-Cremaster

Show answer
Correct Option: A

Which of these tissues is responsible for contractions that allow the movement of the body?

biology movement and locomotion in man types of muscles muscles muscles and their structure

  1. Muscle

  2. Nervous

  3. Epithelial

  4. Connective

Show answer
Correct Option: A
Explanation:

Skeletal muscles are involved in contraction and relaxation. An action potential travels through the motor neuron. The motor neurons are linked to the muscle fibers at the neuromuscular junction. When this nervous signal reaches the neuromuscular junction the neurotransmitter called acetylcholine is released. This neurotransmitter binds to the receptors on the surface of the muscle fiber leading to muscular contraction. Thus the correct answer is option A.

Standing on tip toe is an example of

biology movement and locomotion in man types of muscles muscles muscles and their structure

  1. Elevation

  2. Flexion

  3. Extension

  4. Retraction

Show answer
Correct Option: A
Explanation:
  • Joints are points of contact between bones, or between bones and cartilages.
  • Synovial joints are characterized by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. These joints help in locomotion and many other movements. The hinge joint is a type of synovial joint.
  • extension refers to movement in the posterior direction. For example, when standing up, the knees are extended.
  • Hence standing on tiptoe(HINGE JOINT AT ANKLE) is an example of an extension.
  • So, the correct answer is 'Elevation'.

Which of the following muscles move the lower jaw, tongue and the head backward?

biology movement and locomotion in man types of muscles muscles muscles and their structure

  1. Abductor

  2. Retractor

  3. Proctor

  4. All of the above

Show answer
Correct Option: B
Explanation:
  • A muscle that draws a body part backward is called Retractor.
  • For example, The horizontal fibers of the temporalis muscle serve to retract the mandible(lower jaw).
  • Hence retractor muscles move the lower jaw, tongue and the head backward.
  • So,the correct answer is 'Retractor'.

Cytoplasm of a muscle cell is?

biology movement in animals types of muscles muscles muscles and their structure muscle contraction

  1. Neuroplasm

  2. Sarcoplasm

  3. Axoplasm

  4. Sarcolemma

Show answer
Correct Option: B
Explanation:

  • Sarcoplasm is the cytoplasm of a myocyte (muscle fibre, muscle cell).
  •  It is comparable to the cytoplasm of other cells, but it contains unusually large amounts of glycosomes (granules of stored glycogen) and significant amounts of myoglobin, an oxygen-binding protein. Hence, the Cytoplasm of a muscle cell is sarcoplasm.
So, the correct answer is 'sarcoplasm'.