Tag: biology

Questions Related to biology

The type of muscle fibre present in the wall of alimentary canal is 

biology animal tissue muscle tissue structure of protein muscle tissues

  1. smooth muscle fibre

  2. striped muscle fibre

  3. cardiac muscle fibre

  4. both (a) and (b)

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Correct Option: A
Explanation:
The wall of the gut or the alimentary canal is made up of smooth muscle fibres. The presence of these muscles makes it an involuntary organ.
So, the correct answer is 'smooth muscle fibre'.

Which of the following statements is incorrect ?

biology animal tissue muscle tissue structure of protein muscle tissues

  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

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Correct Option: A
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'.

Largest smooth muscle is present in _____________.

biology animal tissue muscle tissue structure of protein muscle tissues

  1. Leg

  2. Thigh

  3. Uterus of pregnant woman

  4. Urethra

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Correct Option: C

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

biology animal tissue muscle tissue structure of protein muscle tissues

  1. Iris Involuntary smooth muscle

  2. Heart wall Involuntary unstriated muscle

  3. Biceps of upper arm smooth muscle fibers

  4. Abdominal wall smooth muscle

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Correct Option: A

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?

biology animal tissue muscle tissue structure of protein muscle tissues

  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

Show answer
Correct Option: C
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.

How many pairs of sympathetic ganglia are present in ANS?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. $10$

  2. $12$

  3. $22$

  4. $31$

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Correct Option: C
Explanation:
  • The autonomic nervous system(ANS) is the part of the nervous system responsible for the control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes.
  • Sympathetic ganglia deliver information to the body about stress and impending danger and are responsible for the familiar fight-or-flight response.
  • There are usually 22-23 pairs of sympathetic ganglia present in ANS: 3 in the cervical region (cervical ganglia), 11 in the thoracic region (note the presence of the stellate cervicothoracic ganglia), 4 in the lumbar region and 4-5 in the sacral region.
  • So, the correct answer is '22'.

Choose the incorrect statement for Autonomic nervous system.

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Acts on skeletal muscles

  2. Acts on smooth muscles

  3. Consists of ganglia formed by pre and post ganglionic neurons

  4. Consists of sympathetic and parasympathetic nervous system

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Correct Option: A
Explanation:

The autonomic nervous system is a division of the peripheral nervous system that supplies smooth muscle and glands, and thus influences the function of internal organs. 

  • The autonomic nervous system has three branches: the sympathetic nervous system, the parasympathetic nervous system and the enteric nervous system.
  • The autonomic nervous system is unique in that it requires a sequential two-neuron efferent pathway; the preganglionic neuron must first synapse onto a postganglionic neuron before innervating the target organ.
  • So, the correct answer is 'Acts on skeletal muscles'.

Which of the following integrates Nervous and endocrine system?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Hypothalamus

  2. Pineal gland

  3. Adrenal gland

  4. Thymus

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Correct Option: A
Explanation:
  • The hypothalamus is a small region of the brain. It's located at the base of the brain, near the pituitary gland. 
  • The hypothalamus is the link between the endocrine and nervous systems. The hypothalamus produces releasing and inhibiting hormones, which stop and start the production of other hormones throughout the body.
  • Hence Hypothalamus integrates Nervous and endocrine system.
  • So, the correct answer is 'Hypothalamus'.

Vagus nerve is

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Spinal nerve

  2. Sympathetic nerve

  3. X-cranial nerve

  4. Parasympathetic nerve

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Correct Option: C
Explanation:

Vagus is $10^{th}$ cranial nerve. It originates from the sides of medulla oblongata. In vertebrates it consists of sensory and motor fibres.

If a man could learn to stop his heart beat at will, he must have control over his

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Central nervous system

  2. Peripheral nervous system

  3. Autonomic nervous system

  4. Cranial nerves

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Correct Option: C
Explanation:

The central nervous system includes brain and spinal cord. It integrates and stores the sensory information from external and internal sense organs and commands different organs to respond accordingly. This makes option A incorrect. Peripheral nervous system lies outside the central nervous system. It serves to carry the sensory information from external sensory receptors to CNS and motor signals from CNS to skeletal muscles via its somatic division (the voluntary actions). The autonomous division of peripheral nervous system controls the cardiac and smooth muscles and glands, thereby the functioning of internal organs, without our conscious control (the involuntary actions). This makes option B incorrect and option C correct. The 12 pairs of cranial nerves are part of peripheral nervous system and are mostly concerned with head, neck and facial region of the body (vagus nerve X being the part of autonomous division serves as an exception). Option D is incorrect.  Correct answer is C.