Physiology 1021 Lecture Notes - Endocrine Gland, Releasing And Inhibiting Hormones, Codocyte

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carminecod4

30 Jan 2012

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The endocrine system: y consists of a series of glands that secrete different chemicals into the blood y these hormones then travel throughout the body to their large target site to initiate their effect y. Depending on chemical makeup of the hormone - it will have a very specific way in which it is carried in the blood and acts on the target cell: Hydrophilic - therefore they can circulate freely in the blood. Hydrophobic - therefore they require a protein carrier to help them circulate in the blood. Hydrophilic - therefore they cannot diffuse through the cell membrane. Hydrophobic - therefore they can diffuse easily through the cell membrane. Receptor - must be located on the cell. Receptor - located inside the target cell membrane of the target cell since it cannot diffuse into the cell. **whether the hormone is hydrophilic or hydrophobic determines how it is carried and acts on the target cell**

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1. An interesting one-dimensional system is the simple pendulum,consisting of a point mass m, fixed to the end of a massless rod(length l), whose other end is pivoted from the ceiling to let itswing freely in a vertical plane, as shown in figure below. Thependulumâs position can be specified by its angle ? from theequilibrium position. (It could be equally specified by itsdistance s from equilibrium, i.e. s = l?, but the angle is moreconvenient).
(a) Prove that the pendulumâs potential energy (measured from theequilibrium level) is

(b) Write down the total energy E as a function of ? and .
(c) Show that by differentiating your expression for E with respectto t you can get the equation of motion for ? and that the equationof motion is just the familiar (where is the torque, I is themoment of inertia, and ? is the angular acceleration)
(d) Assuming that the angle ? remains small throughout the motion,solve for ?(t) and show that the motion is periodic withperiod

what are the thermodynamic specifications for the materialcomponents of a heat pack. what is the process used to generateheat â the chemical/material process and describe the use ofmaterial selection in relation to its appropriateness for usewithin a pocket warmer.

Discussion as to the enthalpy changes upon âactivatingâ the warmer.Details of the amount of energy released and brief comparison withother systems/justification for selecting your material andcovering. How much material is required, the energy output from it(Enthalpy of hydration etc) and the temperature increase expected(taking in account heat capacity of the material components) fromthe process involved (remember to factor into the calculations âthe actual amount of material being used).

I am not even sure will to begin with this problem anysuggestions?

Physiology 1021 Lecture Notes - Endocrine Gland, Releasing And Inhibiting Hormones, Codocyte

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