40) The part of the brain stem which stimulates the internal intercostal and abd

Question

40) The part of the brain stem which stimulates the internal intercostal and abdominal muscles to contract causing forceful exhalation when running is the A) inspiratory area of the medulla oblongata B) expiratory area of the medulla oblongata C) pneumotaxic area of the pons D) apneustic area of the pons E) B and D are correct The reason to my answer is 41) Select the correct statement A) The inspiratory center controls the pneumotaxic center, causing rapid shallow breathino B) The expiratory center controls the pneumotaxic center, causing prolonged exhalation. C) The apneustic center stimulates the inspiratory center, causing prolonged inhalation. D) The pneumotaxic center stimulates the expiratory center, causing sudden exhalation. All of these are correct The reason to my answer is 42) Which parts of the brain can influence respiratory rate and depth other than those in the brain stem A) cerebral cortex B) limbic system D) A and B are correct E) A, B and C are correct The reason to my answer is 43) Select the best statement about the chemoreceptors A) in the medulla oblongata detect changes in H and CO2 concentrations in cerbrospina B) in the aortic and carotid bodies detect only changes in O2 concentrations in blood. C) of the peripheral nervous system send sensory impulses to the brain stem via cranial nerve XI D) responding to high concentrations of Ht and CO2 inhibit the inspiratory area. E) responding to low concentrations of O2 inhibit the pneumotaxic area. fluid. The reason to my answer is

Explanation / Answer

Answer 40

b) expiratory area of the medulla oblongata

because during quiet breathing this center is inactive and inspiratory center is the active center, but when we run the inspiratory center is inhibited it becomes active.

Answer 41

C) The apneustic center stimulates the inspiratory center, causing prolonged inhalation.

Because there are Coordinates transition between inhalation and exhalation

prolongs inhalate -It Sends stimulatory impulses to the inspiratory area

Answer 42

e) A, B and C are correct

Cerebral cortex activating medullary respiratory centres causes hyperventilation.certain emotion stimuli affect the respiration rate – limbic system and hypothalamus

Answer 43

A)

Because chemoreceptor are placed in the medulla oblongata.They are sensitive to increase in hydrogen ion.Hydrogen ion cannot cross blood cerebrospinal fluid barrier. carbon dioxide increases in the blood it can cross both the barrier easily and after entering the brain it combines with water to form carbonic acid.where carbonic acid is unstable, it dissociates into hydrogen and bicarbonate ions.now hydrogen ion stimulates the central chemoreceptor which stimulates dorsal group of respiratory center and increase rate and force of breathing.

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