The respiratory centre in the brain is stimulated by
CO2 concentration in venous blood
O2 concentration in artery blood
CO2 concentration in artery blood
O2 concentration in venous blood
C.
CO2 concentration in artery blood
Respiratory centre controls rhe rate of respiration. It is located in medulla oblongata and pons. It has the following components:
(i) Inspiratory area
(ii) Pneumotaxic area
(iii) Expiratory area
(iv) Chemosensitive area
Chemoreceptors located on carotid and aortic bodies are sensitive to carbon dioxide levels in arterial blood. They send information to respiratory centre. Oxygen does not have a significant direct effect on the respiratory centre of the brain.
Wooden doors swell up and get stuck during the rainy season. This is due to the phenomenon of
imbibition
endosmosis
capillarity
deplasmolysis
Which floral family has (9) + 1 arrangement or anthers in the androecium ?
Malvaceae
Rutaceae
Fabaceae
Caesalpinaceae
If a stimulus, several times greater than the threshold stimulus is provided to a muscle fibre, it will
contract with a larger force
contract with a smaller force
contract with the same force
undergo tetany.
Which of these are considered most essential in the origin of life?
Enzymes
Nucleic acids
Carbohydrates
Proteins
Barr body is found in the cytoplasm during
interphase in cell of female mammal
interphase in cell of male mammal
prophase in cell of female mammal
prophase in cell of male mammal
