PEDS200 Lecture : Chapter 10 - Cardiovascular System And Exercise

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taupewalrus464

22 Dec 2011

School

University of Alberta

Department

Physical Education and Sport

Course

PEDS200

Professor

Dan Syrotuik

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Document Summary

The cv system is involved in y transport of o2 and co2 y supply nutrients (ex. Substrates, h2o, minerals etc. ) y circulation of compounds such as hormones y waste removal (ex. urea) y regulation of blood flow y thermoregulation. Result y coordinated contraction of heart musculature to allow filling and emptying of blood. Cardiac output (q) ~ 4500 5000 ml/min. Control of the cv system: autonomous nervous system: Sympathetic control stimulates via release of norepinephrine from sympathetic nerve endings: increase in hr, sv, and q. Parasympathetic control - release of acetylcholine from nerve endings: decrease in hr, Increase in afferent nerve activity from mechano-receptors, increase in cns drive, resulting in an increase in q. Local vasodilation @ working tissue and an increase in the y thus vascular pressure is reduced at diastole during exercise to near resting values number of arterioles, reduces tpr.

Related Questions

The P wave of the electrocardiogram is a signal from

A) the SA node.

B) depolarization of the AV node.

C) depolarization of the atria.

D) repolarization of the atria.

E) depolarization of the ventricles

bluellama485

DUE DATE: 12 00 noon Monday. Dec 6. 2010. The problems on this assignment are quite word because strong direction is being given to Students in how to proceed. Two problems will be selected at random for marking. Percentage polarization. It is useful to characterize partially polarized light in terms of its "percentage polarization". A light beam of constant intensity Io. is allowed to fall at normal incidence on an "ideal linear polarizer" (a linear polarizer is "ideal" if it panes all light polarized parallel to the polarizer's axis, and stops all light polarized perpendicular to that axis.) As the ideal polarizer is rotated continuously (see Figure 8.1; about an axis perpendicular to its plane, the transmitted intensity I passes through successive maximum and minimum values (denoted by I max and I min). The percentage polarization of the incident light is denned to be Find the percentage polarization measured in this way for the following light beams: "Unpolarized natural light" tor which I max = I min = Io/2. A beam of light. Initially unpolarixed. that has been passed through an ideal linear polarizer before being measured for percentage polarization. A beam of light, initially unpolarizcd, that has been passed through a non-ideal polarizer that (in terms of light intensity) transmits 70% of light polarized parallel to its polarizing axis and 20% of light polarized perpendicular to its polarizing axis. Circularly polarized light. (Circular polarization means that at any given fixed observation point In the beam, the E-vector has constant magnitude but rotates at the frequency of the electric field oscillations so that the tip of the vector describes a circle in the zy plane (perpendicular to the light ray at the point in question). Elliptically polarized light for which the tip of the E-vector moves on an ellipse in the x y plane, defined by where Ax and Ay are the amplitudes of the oscillating Ex and E y components of the electric field vector, and is the phase difference between those oscillations. NOTE: Do your calculation for the special case Ax = 2Ay and e =pi / 2. [(8.2) taxes a particularly simple form when e = pi / 2.]

With two Polaroid filters, specially fabricated plastic sheetshaving the property that they transmit light which is linearlypolarized along a certain directionâcalled the âpolarizationdirectionâ of the filterâdetermined by material properties of theplastic sheet. Conversely, Polaroid filters absorb light polarizedat right angles to the polarization direction.
Determination of the polarization direction: Find an outsidehorizontal surface lying
between you and the general direction of the sun from which glareis apparent. This
can be a parking lot surface, pool of water or myriad otherobjects. View the object
through one of your filters and rotate it about the line-of-sight.You should observe
the apparent brightness change as you rotate the filter. When thescene is at its
brightest, you have found the polarization direction for yourfilterâit lies in the
horizontal plane for reasons that are well understood but outsidethe scope of this
exercise. You can mark it on your filter with a piece of scotchtape. Determine the
polarization direction of the second filter and mark it.

**Please explain in details**

PEDS200 Lecture : Chapter 10 - Cardiovascular System And Exercise

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Physics: Principles with Applications

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