Tag: nervous system of man

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Questions Related to nervous system of man

Multiple choice biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

A sudden and spontaneous reflex which leads to the quick pulling of hand on touching a hot object is generated by
I. Brain
II. Spinal cord
III. Sensory neurons
IV. Motor neurons

  1. I and IV

  2. III and IV

  3. I, III and IV

  4. II, III and IV

  5. I, II, III and IV
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A reflex action is defined as a spontaneous, involuntary, automated, nerve-mediated activity produced at the unconscious level  by stimulating specific receptors. In other words, a reflex action is a sensory impulse, automatically converted into a motor effect with the involvement of the central nervous system. These actions are sudden and automatic and take place even before one can feel the stimulus through the brain. The quick pulling of the hand on touching a hot object is an automated response to stimuli and is controlled and regulated by the spinal cord along with the sensory and motor neurons which connect the receptor and effector organs. Thus, the correct answer is option C.

Multiple choice biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

Which one of the following is the complex reflex activity?

  1. Swallowing the food bolus is a complex reflex activity controlled by olfactory lobe of brain

  2. Chewing is controlled by somatic nerves, which is complex reflex activity.

  3. Swallowing the food bolus is a complex reflex activity controlled by medulla oblongata.

  4. Secretion of saliva is a conditional reflex activity.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Reflex actions are involuntary actions that are either performed when learnt or innately performed. A complex reflex action is made up of a polysynaptic pathway, wherein, more than one synaptic junctions are involved. Swallowing of food bolus is a reflex activity that involves a polysynaptic pathway and is under reflexive or involuntary control. This stage of the swallow begins after food which has been masticated has been gathered together in the mouth and formed into a bolus which is passed from the posterior tongue. It is controlled by medulla oblongata.

Hence, the correct answer is 'Swallowing the food bolus is a complex reflex activity controlled by the medulla oblongata'.

Multiple choice biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

The direction of response is opposite in which of the following reflex action?

  1. Biceps tendon relfex

  2. Knee jerk reflex

  3. Tricep tendon reflex

  4. Withdrawal reflex
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are 4 types of spinal reflex action, namely the stretch reflex, the Golgi tendon reflex, the crossed extensor reflex and the withdrawal reflex. The direction of response is opposite in withdrawal reflex action. The withdrawal reflex is also called as flexor withdrawal reflex. It protects the body from damaging stimuli. It is polysynaptic. Hence, it causes the stimulation of sensory, association and motor neurons.  For example, when a person touches a hot iron, he withdraws his hand from it within fraction of seconds. In this, the heat stimulates temperature and danger receptors in the skin, triggering a sensory impulse that travels to the central nervous system. The sensory neuron synapses with interneurons and connects to motor neurons. These motor neurons send motor impulses to the flexors and allows withdrawal.

Thus, the correct answer is 'Withdrawal reflex.'

Multiple choice biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

Goose flesh in severe cold

  1. Reduces heat loss from body

  2. Increases heat loss from body

  3. Protects animal from external shocks

  4. Decreases activity of sweat glands
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A person experiences goose bumps in the presence of extremely cold temperatures. Tiny muscles attached to each hair follicle contracts because of the stimulus of cold surroundings. The hair strands stand on the end due to this contraction of muscles. The contracted tiny muscles cause bunching of the skin around hairs, which results in bumps in the goose bumps. The goose bumps are helpful to reduce the heat loss from the body and it is a way of preserving body's heat by causing the hairs on the skin to stand up. 

Multiple choice biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

Which of the following is not a component of the reflex?

  1. Receptor

  2. Effector

  3. Motor neuron

  4. Plexus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plexus is a powered weight loss supplement that mix with water and drink. Plexus is slim claimed to help you lose weight by making you feel more full. It is also claimed to help reduce blood sugar and cholesterol levels.

So, the correct option is 'Plexus'.

Multiple choice biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

Choose the correct answer from the alternatives given.
Which of the following are the first and last elements in a spinal reflex?

  1. Axon and dendrite

  2. Sense organ and muscle effector

  3. Ventral horn and dorsal horn

  4. Motor neuron and sensory neuron
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • Receptor - sense organ in the skin, muscle, or another organ.
  • Sensory neuron - carrier impulse within CNS
Interneuron - carrier impulse within CNS
  • Motor neuron - carrier impulse towards CNS
  • Effector - structure by which an animal responds.
So, the correct option is 'Sense organs and muscle effector'.

Multiple choice zoology nervous system of man parts of the brain brain and its parts brain

The posture and equilibrium is maintained by which part of the brain?

  1. Hypothalamus

  2. Medulla oblongata

  3. Cerebrum

  4. Cerebellum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. The function of the hypothalamus is to link the nervous system to the endocrine system via the pituitary gland.
B. The medulla oblongata is a part of the brain and it is a center for respiration and circulation. Sensory and motor neurons from the forebrain and midbrain travel through the medulla.
C. The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action.
D. The cerebellum (back of brain) is located at the back of the head. Its function is to coordinate voluntary muscle movements and to maintain posture, balance, and equilibrium.
So, the correct answer is "Cerebellum".
Multiple choice zoology nervous system of man parts of the brain brain and its parts brain

Motor learning is related to .............

  1. Cerebellum

  2. Cerebrum

  3. Pons

  4. Medulla oblongata
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cerebellum is an area of the mind that assumes an imperative job in engine control. It might likewise be associated with some intellectual capacities, for example, consideration and dialect, and in controlling trepidation and joy reactions, however, its development related capacities are the most firmly settled.


So, the correct option is 'Cerebellum'.

Multiple choice zoology nervous system of man parts of the brain brain and its parts brain

Which of the following is not a structure in the hindbrain?

  1. Medulla oblongata

  2. Thalamus

  3. Cerebellum

  4. Pons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hindbrain has 3 parts - (1) pons, (2) cerebellum, (3) medulla oblongata. Diencephalon is a small and posterior part of forebrain. It is covered by cerebrum. It consists of thalamus, hypothalamus, epithalamus and metathalamus.