Tag: zoology

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Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

....... circulation is related with lungs.

  1. Coronary

  2. Biliary

  3. Pulmonary

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

The blood pumped by the right ventricle enters the pulmonary artery, whereas the left ventricle pumps blood into the aorta.The deoxygenated blood pumped into the pulmonary artery is passed onto the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium. This pathway constitutes the pulmonary circulation. 

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

Mountain sickness is also called as

  1. Hill sickness.

  2. Altitude sickness.

  3. Elevation sickness.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Altitude sickness is also known as acute mountain sickness (AMS), altitude illness, hypobaropathy, "the altitude bends" or soroche is a pathological effect of high altitude on humans, caused by acute exposure to low partial pressure of oxygen at high altitude. It commonly occurs above 2,400 metres (8,000 feet). 

Therefore, the correct answer is option B.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

The breathing center in the brain responds to changes in the 

  1. Oxygen concentration of the blood.

  2. Carbon dioxide concentration of the blood.

  3. Glucose in the mitochondria.

  4. Acetyl coenzyme A in the mitochondria.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The breathing centre in the brain responds to changes in the carbon dioxide concentration of the blood.

The respiratory center (RC) is located in the medulla oblongata and pons, which are part of the brain stem. The RC receives controlling signals of neural, chemical and hormonal nature and controls the rate and depth of respiratory movements of the diaphragm and other respiratory muscles.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

During respiration, there is 

  1. A gain in dry weight

  2. A loss in dry weight

  3. No change in weight

  4. All of the above depending on the type of respirable material
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Respiration is a process based on chemical reaction and takes place  in all living cells. In this process, energy is released from glucose, for the functioning of our cells. Sugars used as a substrate for respiration comes from the hydrolysis of starch which results in loss of dry matter. 

Therefore, the correct answer is option B.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

Match and find the correct combination
a) Respiration in bacteria
b) Respiration in cyanobacteria
c) Respiration in eucaryotic cells
d) Mitochondria
e) Cytoplasmic membranef) Mesosomes

  1. a e, b f, c d

  2. a f, b e, c d

  3. a d, b f, c e

  4. a e, b d, c f
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bacteria perform respiration via the cytoplasmic membrane, while cyanobacteria use specialized extensions of the plasma membrane called mesosomes. Eukaryotic cells utilize mitochondria for cellular respiration.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

Which of the following statement(s) is (are) true about respiration?

  1. During inhalation, ribs move inward diaphragm is raised.

  2. In the alveoli, exchange of gases takes place i.e.oxygen from the alveolar air diffuses into blood and carbon dioxide from blood to the alveolar air.

  3. Alveoli increases surface area for exchange of gases.

  4. Both B and C.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The main respiratory surface in humans is the alveoli, which are small air sacs branching off from the bronchioles in the lungs. They are one cell thick and provide a moist and extremely large surface area for gas exchange to occur. Capillaries carrying deoxygenated blood from the pulmonary artery run across the alveoli. Due to the enormous number of alveoli (approximately 300 million in each human lung), the surface area of the lung is very large (75 m2). Having such a large surface area increases the amount of gas that can diffuse into and out of the lungs.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

All cells use oxygen to produce energy.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Not all cells use oxygen to produce energy. Aerobic cells use oxygen to produce energy. Anaerobic organisms do not require oxygen to produce energy. They obtain energy from metabolism in absence of oxygen. For example, yeasts in absence of oxygen convert sugar into alcohol and produces energy. This energy is then utilized for their survival.

Thus, the correct answer is option B.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

Rate of respiration is directly affected by the

  1. Concentration of $CO _2$.

  2. Oxygen in trachea.
  3. Concentration of $O _2$.

  4. Diaphragm expansion.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rate of respiration is highly dependent on concentration of carbon dioxide. The higher the concentration of carbon dioxide, less is the rate of respiration. Less the concentration of oxygen and more is the concentration of carbon dioxide, respiration rate increases.

So, option A "Concentration of Carbon dioxide"is the correct option.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

Which of the following gases makes the most stable combination with the haemoglobin of red blood cells? 

  1. ${ CO } _{ 2 }$
  2. $CO$
  3. ${ O } _{ 2 }$
  4. ${ N } _{ 2 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The combination of oxygen with haemoglobin is called oxyhaemoglobin and this oxygenated blood is carried away from the lungs through the bloodstream to all the tissues of the body. 
  • Carbon monoxide can also bind to haemoglobin but does so about 240 times more tightly than oxygen, forming a compound called carboxyhaemoglobin. 
  • This means that if both carbon monoxide and oxygen are inhaled, carbon monoxide will preferentially bind to haemoglobin. 
  • This reduces the amount of haemoglobin available to bind to oxygen, so the body and tissues become starved of oxygen.
Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

Which of the following is not a characteristic of good respiratory surface?

  1. Thin and moist

  2. Large surface area

  3. Close to oxygen and gas transport.

  4. Thick and dry surface
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The characteristics of a respiratory surface are thin walls, a moist inner surface, a huge combined surface area, a rich blood supply each alveolus is sounded by capillaries. Surfaces which dries out easily, thick and easily damaged are not a characteristic of good respiratory surface. 

Therefore, the correct answer is option D.