Biology · General Awareness

Muscle Biology

836 Questions

Muscle biology covers the structures, functions, and contraction mechanisms of skeletal, cardiac, and smooth muscles. Test questions target filaments, stimuli, and specific muscle roles. A clear understanding helps secure marks in biology sections.

Skeletal muscle controlCardiac muscle propertiesMuscle contraction mechanismActin and myosin filamentsMuscle functions

Muscle Biology Questions

Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Which of the following statements is incorrect ?

  1. Smooth muscles are ,found in urinary bladder, alimentary canal and genital

  2. A striated muscle Is a syncylium Le., a multinudeate structure

  3. The cytoplasm of striated muscle is called endoplasm

  4. The plasma membrane and ER of striated muscles are called sarcolemma and sarcoplasmic reticulum respectively
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Smooth muscles are found in the urinary bladder, alimentary canal, and genitals. They are involuntary muscles and have a major role in the transport of substances.
So, the correct answer is ' Smooth muscles are found in urinary bladder, alimentary canal and genital'.
Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Which one of the following is correct pairing of a body part and like kind of muscle tissue that moves it ?

  1. Iris Involuntary smooth muscle

  2. Heart wall Involuntary unstriated muscle

  3. Biceps of upper arm smooth muscle fibers

  4. Abdominal wall smooth muscle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The iris of the eye contains involuntary smooth muscle fibers that control the size of the pupil.

Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Select the correct option:

Which one of the following is correct pairing of a body part with the kind of muscle tissue present in it?

  1. Biceps of upper arm- Smooth muscle fibres

  2. Abdominal wall- Voluntary smooth muscle

  3. Iris- Involuntary smooth muscle

  4. Heart wall- Involuntary unstriated muscle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Involuntary smooth muscles are those muscles that are not under the control of our will and are without any striations (stripes). Iris has involuntary smooth muscle. Biceps of upper arm have  striated muscle fibres and abdominal wall has involuntary smooth muscles. Heart wall has involuntary striated muscle.

Multiple choice zoology tissue level of organisation muscle tissue structure of protein muscle tissues

What is sarcomere ?

  1. Part between two H-lines

  2. Part between two A-lines

  3. Part between two I-bands

  4. Part between two Z-lines
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The sarcomeres are fibrous protein filaments that slide past one another when the muscle contracts or relaxes. It is basically the region between two Z-bands.
So, the correct answer is 'Part between two Z-lines'.
.
Multiple choice zoology endocrine system and chemical co-ordination mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

In heart cells, which one a second messenger that speeds up muscle contraction in response to adrenaline 

  1. cAMP

  2. cGMP

  3. GTP

  4. ATP

  5. AMP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Adrenaline binds to its receptors present on the cell surface i.e. plasma membrane. In heart muscles, cAMP (cyclic adenosine monophosphate) acts as a second messenger. It increases muscle contraction in response to adrenaline which is a neurotransmitter secreted from adrenal medulla. cGMP (cyclic guanosine monophosphate) also acts as a second messenger but it decreases muscle contraction in response to acetylcholine.
So, the correct answer is 'cAMP'.
Multiple choice evs bones skeletal system and muscles assimilation of food components and importance of food

Read the following statements and find out the incorrect statement.
A. About $45-50\%$ of the body weight of a human adult is contributed by muscles.
B. Muscles have special properties like excitability, contractility, extensibility and elasticity.
C. Based on their location, three types of muscles are identified: skeletal, smooth and cardiac.
D. Based on appearance, cardiac muscles are striated. They are involuntary in nature as the nervous system does not control their activity directly.

  1. B & C

  2. A & C

  3. Only A

  4. A & D
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  1. A major bulk of body weight; 45−50% is contributed by muscles.
    2. All muscle cells share four primary properties that distinguish them from other cells : excitability, contractility, extensibility and elasticity.
    3. Based on their location, three types of muscles are identified: skeletal, smooth and cardiac.
    4. Cardiac muscles are striated in appearance and myogenic in nature.
    So, none of the given options are incorrect.
Multiple choice biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food

Which of the following statement is INCORRECT in case of defaecation in the human body?

  1. Defaecation involves both voluntary and involuntary process

  2. Voluntary contractions of abdominal muscles and diaphragm aid in defaecation

  3. Decrease in intra abdominal pressure aids in the process of defaecation

  4. Distention of rectal wall induces defaecation reflex
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Defaecation is the process in which removal of fecal matter outside the body. It involves:-

1)Both voluntary and involuntary process the signal provided can be controlled by the person.
2)Voluntary contractions of abdominal muscles and diaphragm aid in defaecation.
3)Increase in intra abdominal pressure aids in the process of defaecation.
4)Distention of rectal wall induces defaecation reflex.
So the correct option is 'Decrease in intra abdominal pressure aids in the process of defaecation'.

Multiple choice bio-chemistry digestive system of human digestive system - organs process of digestion coordination in the process of digestion

Tongue is made up of?

  1. Smooth muscles

  2. Skeletal muscles

  3. Both (A) and (B)

  4. Cartilage
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer : 
i) The tongue is composed of skeletal muscle fibers and smooth muscle fibers. 
ii) Unlike the cardiac muscle or smooth muscle of the organs and digestive system, skeletal muscle can be willingly controlled. 
iii) This allows for the tongue's mobility. 
iv) The muscles that lace throughout the organ secure it to surrounding bones and create the floor of the oral cavity. 
v) Mucous membrane covers the skeletal muscle and protects the body from microbes and pathogens.
vi) While muscularis mucosa is composed of a layer of smooth muscle fibers.

So the correct answer is option C. Both (A) and (B).
Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Middle part of oesophagus in human being is

  1. Voluntary only

  2. Involuntary only

  3. Both voluntary and involuntary

  4. Skeletal muscles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The oesophagus is a hollow, muscular tube that connects the mouth to the stomach and also carries food and liquids to the stomach from the mouth.
  • It is usually around 9 to 10 inches in adults which begins at the pharynx and passes behind the trachea or windpipe.
  • The upper part of the oesophagus is made up of striated or voluntary muscles.
  • The middle part is composed of both striated and smooth or involuntary muscles.
  • The lower part is made up of smooth muscles only.
  • The oesophagus consists of two sphincters.
  • The upper oesophagal sphincter is single ringlike cartilage which is both voluntary and involuntary in nature and it prevents food and liquids from entering the windpipe (trachea,)
  • The lower oesophagal sphincter is involuntary and prevents gastric acids from travelling into the oesophagus and it opens into the diaphragm.
  • So, the correct answer is 'Both voluntary and involuntary'.
Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Muscles of alimentary canal are chiefly _______________.

  1. Striated and Neurogenic

  2. Unstriated and Neurogenic

  3. Striated and Myogenic

  4. Unstriated and Myogenic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The muscles of the alimentary canal are smooth (unstriated) muscles, which are involuntary. Their activity is regulated by the autonomic nervous system and intrinsic plexuses, making them neurogenic.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Aurebach's plexus is present in between.

  1. Longitudinal and oblique muscles of stomach

  2. Oblique muscles and submucosa

  3. Circular and longitudinal muscles of stomach

  4. Submucosa and mucosa
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Auerbach's plexus (myenteric plexus) is located between the inner circular and outer longitudinal muscle layers of the alimentary canal wall.