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Physiology 3120 Study Guide - Cardiac Action Potential, Resting Potential, Pacemaker Potential

33 views8 pages
olivepug245
8 Dec 2011
School
Western University
Department
Physiology
Course
Physiology 3120
Professor
Anita Woods

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Document Summary

The heart: circulation circuits- an easier way to think of the cardiovascular system is as a set of closed tubes (blood vessels) which are filled with fluid (blood) that is moved around by a central pump (the heart). There are really two separate circulation circuits : pulmonary circulation: this circuit delivers blood to the lungs for it to get rid of carbon dioxide and pick up a fresh supply of oxygen (more on this in module. Once it passes through the tissues (picking up some carbon dioxide in exchange for delivering oxygen), it returns to the right side of the heart. If our resting heart beat is 70 beats per minute, and there are 60 minutes in an hour (70 x 60) and 24 hours in a day (x 24); that is equal to 100,800 beats a day. That is a lot of work: the heart structure: You should know the basic structure of the heart.

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Related Questions

In humans,blood flows from the heart to the aorta, from which itpasses into the major arteries. These branch into the smallarteries, which in turn branch into billions of tiny capillaries.Then blood then returns to the heart via the veins. The radius ofthe aorta is about 1.2cm, and the blood passes through it with aspeed of about 40cm/s. A typical capillary has a radius of about4x10-4 cm, and the blood flows through it at a speed of 5x10-2cm/s.

(a) Estimate the number of capillaries in the body.

(b) If the body contains about 5.5 litres of blood how long does ittake for the blood to circulate completely through the body. (1litre = 10cmx10cmx10cm)

The aorta is a major artery, rising upward from the leftventricleof the heart and curving down to carry blood to theabdomen andlower half of the body. The curved artery can beapproximated as asemicircular arch whose diameter is 4.8cm. Ifblood flows through the aortic arch at a speed of0.30 m/s, what isthe magnitude (inm/s2) of the blood's centripetalacceleration?

A series circuit contains a 3.00-H inductor, a 3.00-mF capacitor, and a 30.0-V resistor connected to a 120.-V (rms) source of variable frequency. Find the power delivered to the circuit when the frequency of the source is

(a) the resonance frequency,

(b) one-half the resonance frequency,

(c) two times the resonance frequency, and

From your calculations, can you draw a conclusion about the frequency at which the maximum power is delivered to the circuit?