PHGY 210 Lecture Notes - Lecture 1: Myenteric Plexus, Preganglionic Nerve Fibers, Acetylcholine

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viridianseal889

6 Apr 2017

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The textbook reading ch15, there will be difference. (same information , read it ) Homeostasis maintain constant internal condition, all the body system is to maintain this. The homeostasis is what give us help, the break down will give pathology/disease. The role og git homeostasis : give nutrient to the body. Food from external environment, git will break down the component in to absorbable molecule and transform into the blood stream, interstitial fluid (this is useful for all the cells in body) The break down of component, so they can enter the internal environment. When get to this stage we said the food has been process. At this stage it can be move to blood stream to be delivered to every cell in the body. At the cell, it will be the energy of raw material for the cell to use in growth and repair, also the regulation.

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The laser in a compact disc player must precisely follow the spiral track on CD, along which the distance between one loop of the spiral and next is only about 1.25 micrometre. The figure shows how a diffraction grating is used to provide information to keep the beam on track. The laser light passes through a diffraction grating before it reaches the CD. The strong central maximum of the diffraction pattern is used to read the information in the track of pits. The two first-order side maxima are designed to fall on the flat surfaces on both sides of the information track and are used for steering. As long as both beams are reflecting from smooth, nonpitted surfaces they are detected with the constant high intensity. If the main beam wanders off the track, however one of the side beams begins to strike pits on the information track and the reflected light diminishes. This change is used with an electronic circuit to guide the beam back to the desired location. Assume the laser light has a wavelength of 780 nanometers and the diffraction grating is positioned 6.90 micrometres from time disk. Assume the first-order beams are to fall on the CD 0.400 micrometre on either side of the information track. What should be the number of grooves per millimetre in the grating?

sangriaclam240

Your firm is designing a new roller-coaster ride. The permitprocess requires the calculation of forces and accelerations atvarious important locations on the ride. Each roller-coaster carwill have a total mass (including passengers) of 800 kg and willtravel freely along the winding frictionless track shown in thefigure below. Points A, E, and G are on horizontal straightsections, all at the same height of 10 m above the ground. Point Cis at a height of 10 m above the ground on an inclined section ofslope angle 30Â°. Point B is at the crest of a hill, while point Dis at ground level at the bottom of a valley; the radius ofcurvature at both of these points is 20 m. Point F is at the middleof a banked horizontal curve with a radius of curvature of 35 m andat the same height as points A, E, and G. At point A the speed ofthe car is 11.1 m/s.

(a) If the car is just barely to make it over the hill at point B,what must be the height of point B above the ground?
__ m

(b) If the car is to just barely make it over the hill at point B,what should be the magnitude of the force exerted by the track onthe car at that point?
__kN

(c) What will be the acceleration of the car at point C?
__ m/s2

(d) What will be the magnitude and direction of the force exertedby the track on the car at point D?
__ kN directed 5 ---Select--- upward downward

(e) What will be the magnitude and direction of the force exertedby the track on the car at point F?
__ kN directed 7Â° upward from the horizontal.

(f) At point G a constant braking force is to be applied to thecar, bringing it to a halt in a distance of 30 m. What is themagnitude of this required braking force?
__ kN

7.Someone is walking outside when the temperature of the air is -10°C. The metabolic rate of walking is 140 Cal/m2hr, and the usual muscle efficiency (20%) applies. They are completely covered by clothing with a coefficient of thermal conductivity of 0.36 Cal-cm/m2 hr °C. Their total surface area is 1.7 m2, and this area can be used as the area through which heat is being conducted away from the body. Their skin temperature is the same as the inside surface of the clothing, 35°C. The temperature of the outside of the clothing is -10°C. It is dark outside. Their mass is 75 kg. Ignore heat lost to breathing. How thick does the down have to be to maintain a constant internal body temperature of 37°C?

PHGY 210 Lecture Notes - Lecture 1: Myenteric Plexus, Preganglionic Nerve Fibers, Acetylcholine

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