Practice free Breathing and Exchange of Gases (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
In respiratory system of Cockroach.......... function as filters.
In the respiratory system of a cockroach, chitinous bristles function as filters. They are present at the opening of the spiracles and help to filter out dust and other particulate matter, ensuring that only clean air enters the tracheal system.
Fats under the skin, Extensive oedema and swelling of body parts. These are related to
NCERT page number 266 (New NCERT).
Which of the following is entirely made of cartilage?
Read page 269, XI NCERT.
Trachea divides into two a right and left primary bronchi at the level of:
Read page 269, XI NCERT
When you hold your breath which of the following gas changes in blood would first lead to the urge to breathe?
When you hold your breath the ongoing accumulation of carbon dioxide in your cells, in your blood and lungs will eventually irritate and trigger impulses from the respiratory center part of your brain. Rising levels of carbon dioxide signal the body to breathe and ensure our unconscious and autonomous respiration.
The partial pressure of oxygen in the alveoli of the lungs is
(b) The partial pressure of oxygen (pO2) in alveoli of lungs is 104 mm Hg, which is more than that of blood in the blood capillaries of lung alveoli (40 mm Hg) This difference allows passive diffusion of O2 from air filled in the lungs to the blood vessels of lung alveoli.
Name the chronic respiratory disorder caused mainly by cigarette smoking
(d) Emphysema is characterised by inflation or distension of alveoli by dissolution of wall of the two adjacent lung alveoli. It generally occurs due to chronic cigarette smoking.
People who have migrated from the planes to an area adjoining Rohtang Pass about six months back
As a person moves up a hill the pO2 and total atmospheric pressure decreases. Decrease in pO2, due to increasing altitude, stimulates the JG-cells of kidney to secrete erythropoietin hormone, increasing the number of RBCs (polycythemia) to compensate the supply of O2. At higher altitude, haemoglobin has lower binding affinity to O2, because the primary factor responsible for binding is pO2, which decreases at higher altitude.
A large proportion of oxygen is left unsused in the human blood even after its uptake by the body tissues. This O2
Our tissue are able to utilize only 25% of O2 carried by arterial blood. The venous blood is still 75% saturated with O2. This O2 acts as a reserve during muscular exercise.
What is true about RBCs in humans?
Nearly 20-25 per cent of CO2 is transported by RBCs. It is caused by haemoglobin as carbamino haemoglobin. 70 per cent of CO2 is carried as bicarbonates.
About 97 per cent of O2 is transported by RBCs in the blood. The remaining 3 per cent of O2 is carried in dissolved state through the plasma.
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