Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

Pneumotaxic centre present in ____ and responsible for _______ :

  1. Limbic system , voluntary movement

  2. Hypothalamus, peristalsis

  3. Medulla oblongata , respiratory centre

  4. Pons varolii , respiratory rhythm centre
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pneumotaxic centre is located in the pons varolii region of the brainstem. Its primary function is to moderate the functions of the respiratory rhythm centre, thereby controlling the rate of breathing.

Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

The respiratory centre of the brain is located in 

  1. Medulla oblongata

  2. Pons

  3. Cerebellum

  4. Cerebrum
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Respiratory centres generate rhythmic pattern of breathing and are present in brain stem. The medullary respiratory centres constitute the primary respiratory centre and include two aggregates of neuronal cell bodies namely dorsal respiratory group and ventral respiratory group. They serve to provide output to respiratory muscles. Pontine respiratory centres are present in higher in brain stem in pons and are namely pneumotaxic centre and apneustic centre. Pontine respiratory centres modify the output from medullary centres.

Cerebellum serves to coordinate the voluntary movements of skeletal muscles as well as posture, balance and equilibrium. Cerebrum is the largest and uppermost division of brain.
It is the centre for higher thought processes required for learning, memory, language and speech. 
Therefore, the correct answer is option A and B.

Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

A condition of over breathing is called as

  1. Hyperventilation

  2. Hypoventilation

  3. Hypoxia

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Hyperventilation is a process of quick and deep breathing in which there is more exhalation than inhalation. This leads to reduced concentration of carbon dioxide dissolved in the blood also called hypocapnia.
So, the correct answer is 'Hyperventilation'.
Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

Which of the following is the peripheral chemoreceptor?

  1. Aoritic body

  2. Carotid body

  3. Both A and B

  4. Spinal nerve
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Peripheral chemoreceptors are made up of aortic and carotid bodies. Aortic body control the changes in blood oxygen and carbon dioxide. But carotid body detects changes in pH along with O$ _2$ and CO$ _2$.
So the correct answer is 'Both A and B'.
Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

Steps of respiration are controlled by

  1. Substrates

  2. Enzymes

  3. Hormone

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

  •  Cellular respiration is the process by which cells convert glucose into carbon dioxide and water. 
  • Cellular respiration takes place in three steps: glycolysis, the citric acid cycle and oxidative phosphorylation.
  • The main role of enzymes during the respiration reaction is to assist in transferring electrons from one molecule to another. e.g. In glycolysis, the enzyme dehydrogenase is used. Hence, the steps of respiration are controlled by enzymes.
So, the correct answer is  'enzymes'.

Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

Breathing is controlled by

  1. Lungs

  2. Trachea

  3. Medulla oblongata

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

The medulla oblongata is the lower half of the brainstem, which is continuous with the spinal cord, the upper half being the pons. The medulla contains the cardiac, respiratory, vomiting and vasomotor centres and therefore deals with the autonomic (involuntary) functions of breathing, heart rate, and blood pressure.

Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

The pneumotoxic and respiratory rhythm centres are respectively present in.

  1. Pons and medulla oblongata

  2. Corpus callosum and pons

  3. Medulla oblongata and hypothalamus

  4. Diencephalon and pons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pneumotaxic center is located in the pons, while the respiratory rhythm center is primarily located in the medulla oblongata.

Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

Each $100$ml of human arterial blood carries 'P' ml of $O _2$ and 'Q' ml of $CO _2$ whereas each $100$ml of venous blood carries 'R' ml of $O _2$ and 'S' ml of $CO _2$. Choose the correct values of P, Q, R and S.

  1. P-$48$ml, Q-$19$ to $20$ml, R-$52$ml, S-$14$ to $15$ml
  2. P-$19$ to $20$ml, Q-$48$ml, R-$14$ to $15$ml, S-$52$ml
  3. P-$14$ to $15$ml, Q-$52$ml, R-$19$ml to $20$ml, S-$48$ml
  4. P-$52$ml, Q-$14$ to $15$ml, R-$48$ml, S-$19$ to $20$ml
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Arterial blood carries approximately 19-20 ml of O2 and 48 ml of CO2 per 100 ml, while venous blood carries about 14-15 ml of O2 and 52 ml of CO2.

Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

What is $pO _2$ and $pCO _2$ in synthematic arteries?

  1. $pO _2$ $40$mm Hg, $pCO _2$ $45$mm Hg
  2. $pO _2$ $95$mm Hg, $pCO _2$ $104$mm Hg
  3. $pO _2$ $95$mm Hg, $pCO _2$ $40$mm Hg
  4. $pO _2$ $45$mm Hg, $pCO _2$ $40$mm Hg
  5. $pO _2$ $104$mm Hg, $pCO _2$ $159$mm Hg
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In systemic arteries, the partial pressure of oxygen (pO2) is approximately 95 mm Hg, and the partial pressure of carbon dioxide (pCO2) is approximately 40 mm Hg.