PSL301H1 Lecture Notes - Obex

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15 Dec 2011

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PSL301H1 Full Course Notes

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Organisation (cid:131) ultimately, the control of breathing lies within the central nervous system and so it is there that we must look for the organisation. Consider, for example, that breathing is affected by many factors including: They cause the rhythmic contraction and relaxation of the diaphragm and intercostal muscles. cord segments t1 to t12. (cid:131) all of the factors that affect breathing must do so via the spinal respiratory motoneurons. The battle between the two opposing forces was fought for control of the respiratory motoneurons from the following sources: Rhythm generation (cid:131) the site of respiratory rhythm generation is the medulla. (cid:131) nerve cells (neurons) with a respiratory rhythmic pattern of activity are located there in two, longitudinal bilateral columns. System control loops (cid:131) the respiratory neurons of the medulla not only generate and transmit (efferent) the respiratory rhythm, but also co-ordinate. The respiratory output controls the main respiratory muscles as well as muscles that alter the airway diameter.

Related Questions

air moves out of the lungs because..

a.the gas pressure in the lungs becomes lower than the outside pressure as the diaphragm contracts.
b. contraction of the diaphragm decreases the volume of the pleural cavity.
c. the thorax is muscular.
d. the volume of the lungs decreases with inspiration.
e.the internal intercostal muscles decrease the thoracic cavity volume.

periwinkleraccoon781

If a current of 0.9 mA passed through your body, which one of thefollowing most accurately describes what you would likelyexperience?

___ You wouldn't feel anything. Your body would have no noticablereaction.

___ You would feel a slight tingling sensation.

___ You would feel a slight shock. Most people maintain muscularcontrol.

___ You would feel a painful shock, lose muscular control, and beunable to let go.

___ You would experience extreme pain, stop breathing, and havesevere muscle reactions. Death is possible.

___ Your heart would cease its rhythmic pumping. Muscularcontraction & nerve damage would occur. Death is likely.

___Your heart would stop. You would be burned severely. Death isprobable.

8. Say the person in #7 increases their exertion so that theirmetabolic rate rises to 500 Cal/m2hr. The conditions are the sameas described above with one exception: assume that the clothing isonly 0.1 cm thick. At this thickness, they are definitely losingheat to the environment. This heat loss is the only means they haveto cool themselves (humidity too high inside the clothes toevaporate sweat, ignore heat lost to breathing). At what rate willtheir temperature rise/fall? Use that the specific heat of thebody, on average is 8.3 X 10-4 Cal/g Â°C.

(#7 information - 7. Someone is walking outside when thetemperature of the air is -10Â°C. The metabolic rate of walking is140 Cal/m2hr, and the usual muscle efficiency (20%) applies. Theyare completely covered by clothing with a coefficient of thermalconductivity of 0.36 Cal-cm/m2 hr Â°C. Their total surface area is1.7 m2, and this area can be used as the area through which heat isbeing conducted away from the body. Their skin temperature is thesame as the inside surface of the clothing, 35Â°C. The temperatureof the outside of the clothing is -10Â°C. It is dark outside. Theirmass is 75 kg. Ignore heat lost to breathing.)

PSL301H1 Lecture Notes - Obex

PSL301H1 Full Course Notes

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