Tag: drug, tobacco and alcohol consumption

Questions Related to drug, tobacco and alcohol consumption

ECT is

evs - i community health and hygiene regulation of the activity of heart drug, tobacco and alcohol consumption cardiac regulation and disorders

  1. An apparatus for epilepsy

  2. A durg which acts as sedative

  3. Shock treatment

  4. Artificial organ for human

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Correct Option: C
Explanation:

Electroconvulsion therapy or ECT is a procedure in which electric currents are passed through the brain, intentionally triggering a brief seizure.
So, the correct answer is option C.

Which of the following statements is not true?

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. Regulation of blood vessel diameter originates from the vasomotor centre of the pons

  2. Baroreceptors may stimulate the vasomotor center

  3. Chemoreceptors are particularly sensitive to blood levels

  4. Cerebral cortex can play a role in regulating blood pressure

Show answer
Correct Option: A
Explanation:

The vasomotor center is a portion of the medulla oblongata, that together with the cardiovascular & respiratory centers regulates blood pressure too.

So, the correct option is 'Regulation of blood vessel diameter originates from the vasomotor center of the pons'.

Regarding circulatory adjustments during exercise which of the following is correct?

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. The cardiac output increases more than tenfold in severe exercise.

  2. The increase in cardiac output during exercise is mainly due to an increase in stroke volume.

  3. The increase in stroke volume seen in exercise occurs despite a smaller and end - diastolic volume.

  4. In sever exercise the mean arterial pressure is unchanged because diastolic pressure.

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Correct Option: B

Read the following statements and select the correct ones.


(i) Nodal tissue is specialised cardiac musculature in human heart which has the ability to generate action potential.
(ii) Position of SA Node - right corner of right atrium
(iii) Position of AV Node - right corner of ventricle
(iv) AV bundle continues from AV Node
(v) Purkinje fibres are modified cardiac muscle fibres that originate from the atrioventricular node and spread into the two ventricles.

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. (i) and (ii)

  2. (i), (ii) and (iv)

  3. (ii), (iv) and (v)

  4. All of these

Show answer
Correct Option: D

Consider the following four statements (i) - (iv) and select the correct option.
(i) Fish heart contains only oxygenated blood.
(ii)Closure of A-V valves produces the second heart sound.
(iii) The vascular connection between the digestive tract and kidney is called hepatic portal system.
(iv) Purkinje fibres are nerve fibres present in the heart wall.

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. i - F, ii - F, iii - T, iv - F

  2. i - F, ii - F, iii - F, iv - T

  3. i - T, ii - T, iii - F, iv - T

  4. i - T, ii - F, iii - T, iv - F

Show answer
Correct Option: B
Explanation:

  • The fish heart contains both oxygenate and deoxygenated blood as it has one atrium and one ventricle.
  • Closure of A-V valves produces the first heart sound.
  • The vascular connection between the digestive tract and the liver is called the hepatic portal system.
  • Purkinje fibres are nerve fibres present in the heart wall.
Thus, the correct answer is 'i - F, ii - F, iii - F, iv - T.'

Which of the following statements is correct regarding neural regulation of cardiac activity?

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. The cardiac centre lies in medulla oblongata of brain.

  2. Sympathetic nerve fibres accelerate the rate of heart beat and parasympathetic nerve fibres retard the rate of heart beat.

  3. Sensory fibres extend from the receptors present in the walls of aortic arch, carotid sinuses and vena cava to the cardiovascular centre in medulla oblongata.

  4. All of these

Show answer
Correct Option: D
Explanation:

  • The medulla oblongata of the brain controls cardiac activities.
  • The action of sympathetic nerve fibres increases the heart rate, while that of the parasympathetic nerve fibres decrease it.
  • Sensory fibres extend from the receptors present in the walls of the aortic arch, carotid sinuses and vena cava to the cardiovascular centre in the medulla oblongata.
Thus, the correct answer is 'All of these.'

The problem of electrical discontinuity caused in the normal heart by the connective tissue separating the atria from the ventricles is solved by

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. Coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the bundle of His

  2. Having the A-V node function as a secondary pacemaker

  3. Having an ectopic pacemaker

  4. Coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the vagus nerve.

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Correct Option: B

Cardiac activity could be moderated by the autonomous neural system. Tick the correct answer.

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. The parasympathetic system stimulates heart rate and stroke volume.

  2. The sympathetic system stimulates heart rate and stroke volume.

  3. The parasympathetic system decreases the heart rate but increase stroke volume.

  4. The sympathetic system decreases the heart rate but increase stroke volume.

Show answer
Correct Option: B
Explanation:

Cardiac activity could be moderated by the autonomous neural system. The action of sympathetic nerve fibres increases the heart rate and the stroke volume, while that of the parasympathetic nerve fibres decrease these.

Thus, the correct answer is 'The sympathetic system stimulates heart rate and stroke volume.'

Electric potential of various parts of brain is recorded by an instrument called as

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. Sphygmomanometer

  2. Electrocardiography

  3. Electroencephalography

  4. CT Scan

Show answer
Correct Option: C
Explanation:

An electroencephalogram (EEG) is a test that detects electrical activity in the brain using small, flat metal discs (electrodes) attached to scalp. 

An Evoked Potential Studies (EPS) enables us to

biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

  1. Evaluate different sensory functions

  2. Detect clinically silent tensions

  3. Study hearing and vision in children

  4. All of the above

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Correct Option: D
Explanation:

Evoked potential studies measure electrical activity in the brain in response to stimulation of sight, sound, or touch. Stimuli delivered to the brain through each of these senses evoke minute electrical signals. These signals travel along the nerves and through the spinal cord to specific regions of the brain and are picked up by electrodes, amplified, and displayed for a doctor to interpret. Evoked potentials studies involve three major tests that measure response to visual, auditory, and electrical stimuli. Evoked potential studies may be used to assess hearing or sight, especially in infants and children, to diagnose disorders of the optic nerve, and to detect tumors or other problems affecting the brain and spinal cord. The tests may also be performed to assess brain function during a coma.