Tag: biology

Questions Related to biology

Ischemia is insufficient blood flow to tissues which can result in 

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Asphyxiation

  2. Hypoxia

  3. Anemia

  4. All of the above

Show answer
Correct Option: B
Explanation:

Ischemia, meaning insufficient blood flow to a tissue, can also result in hypoxia. This is called as 'ischemic hypoxia'. This can include an embolic event, a heart attack that decreases overall blood flow, or trauma to a tissue that results in damage. An example of insufficient blood flow causing local hypoxia is gangrene that occurs in diabetes. 

Therefore, the correct answer is option B.

Perinatal asphyxia is seen in 

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Adults

  2. Old people

  3. Newborn infant

  4. All of the above

Show answer
Correct Option: C
Explanation:

Perinatal asphyxia is the medical condition resulting from deprivation of oxygen (hypoxia) to a newborn infant long enough to cause apparent harm. It results most commonly from a drop in maternal blood pressure or interference during delivery with blood flow to the infant's brain. 

Therefore, the correct answer is option C.

The condition of deficiency of oxygen is known as 

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Pyrexia

  2. Hypoxia

  3. Anoxia

  4. Asphyxiation

Show answer
Correct Option: D
Explanation:

Asphyxia or asphyxiation is a condition of severely deficient supply of oxygen to the body that arises from abnormal breathing. 

Therefore, the correct answer is option D.

Asphyxia occurs due to.

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Rise in level of $CO _2$

  2. Fall in level of $CO _2$

  3. Rise of $O _2$ level

  4. Fall in $O _2$ level

Show answer
Correct Option: A

Which one of the following can respire in total absence of air (anoxybiosis)?

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Amoeba

  2. Bed bug

  3. Hydra

  4. Tapeworm

Show answer
Correct Option: D
Explanation:

Tapeworms live in the human gut and can be up to 9 meters long. Parasites have specific features which enable them to survive in or on their host. They use anaerobic respiration, so that they can survive without oxygen.

The mountaineers carry oxygen with them because.

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. At an altitude of more than $5$km there is no air

  2. The amount of air available to a person is less than that available on the ground

  3. The temperature of air is higher than that on the ground

  4. The pressure of air is higher than that on the ground

Show answer
Correct Option: B
Explanation:

The atmospheric pressure goes on decreasing as we go up above the sea level, and the amount of oxygen also decreases at higher altitude. 

So the correct option is 'The amount of air available to a person is less than that available on the ground.'

A condition in which body is deprived of adequate oxygen is called as

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Hyperventilation

  2. Hypoventilation

  3. Hypoxia

  4. None of the above

Show answer
Correct Option: C
Explanation:
Hypoxia is a condition of absence of enough amount of oxygen in the body tissues to sustain bodily function. This condition can occur due to low concentration of oxygen in the environment or due to inadequate breathing.
So, the correct answer is 'Hypoxia'.

Ravi, who lived at sea level, had around 5 million RBC per cubic millimeter of his blood. Later when he lived at an altitude of 18,000 ft, showed around 8 million RBC per cubic millimeter of blood. This is an adaptation because

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. At high altitude, he ate more nutritive food.

  2. He had pollution free air to balance breathe.

  3. At high altitude O$ _2$ level is less, hence, more RBCs were required to absorb enough oxygen.

  4. At high altitude, there is more UV radiation which enhances RBCs production.

Show answer
Correct Option: C
Explanation:

At sea level, our blood is 98% saturated with oxygen and this decreases to 89% at 3000 metres and reaches as low as 40% on the summit of Everest. Red blood cell production increases, resulting in an increased haemoglobin concentration, which is required to pick up oxygen and transport it around the body. This mechanism enables the body to continue to deliver enough oxygen to each cell, despite the lower oxygen levels. 

When the oxygen supply to the tissues is inadequate, the condition is?

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Hypoxia

  2. Asphyxia

  3. Pleurisy

  4. Anoxia

Show answer
Correct Option: A

Ascent of high mountains may cause altitude sickness in men. Prime cause of this is

biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

  1. Excess of O$ _2$ in blood

  2. Decreased efficiency of haemoglobin

  3. Decreased partial pressure of oxygen

  4. Decreased proportion of oxygen in air

Show answer
Correct Option: C
Explanation:

 Altitude sickness (also known as mountain sickness), is caused by gaining altitude too rapidly, which does not allow the body enough time to adjust to reduced oxygen and changes in air pressure, and causes hypobaric hypoxia (a lack of oxygen reaching the tissues of the body).