MCQ
$A$ circulatory system, which is formed by capillaries and ends with capillaries is
- ARenal
- BHepatic
- CDouble circulatory system
- ✓Hypophysial portal system
✓
Answer
Correct option: D.
Hypophysial portal system
d
Hypophysial portal system is a minor portal system that occurs in higher vertebrates. The system consists of a single Hypophysial portal vein, which is formed by capillaries in hypothalamus. It passes into anterior lobe of pituitary gland and breaks up into capillaries there
Hypophysial portal system is a minor portal system that occurs in higher vertebrates. The system consists of a single Hypophysial portal vein, which is formed by capillaries in hypothalamus. It passes into anterior lobe of pituitary gland and breaks up into capillaries there
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(i) CO2 + H2O ⇔ H2CO3 The above reaction is catalyzed by enzyme A , which is present in higher concentration in B and in minute concentration in C of blood.
(ii) Every 100ml of deoxygenated blood delivers approximately D ml of CO2 in alveoli.
(iii) Exchange of O2 and CO2 at the alveoli and tissues occur by E .
(iv) Respiratory rhythm is maintained by the respiratory centre in F region of brain.
(v) A G centre in pons region of brain and chemosensitive area in the medulla can alter respiratory mechanism.
(vi) The chemosensitive area in medulla is sensitive to H and I.
(vii) Receptors associated with aortic arch and J recognize changes in CO2 and H concentration.
(viii) K is a difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles.
(ix) Emphysema is a chronic disorder in which L are damaged due to which respiratory surface is decreased.
(x) Long exposure to dust, in industries involving grinding or stone-breaking, can lead to inflammation leading to M and thus cause serious lung damage.
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