PSL201Y1 Study Guide - Final Guide: Thyroglobulin

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plummammoth203

8 Mar 2011

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*growth {takes place during development} is different from remodelling {takes place constantly} Osteoblasts differentiate at the site of growth plate to start. S chondrocytes are collagen producing cells of cartilage. S ossification is activated by osteoblast differentiation ossification. diet (malnutrition leads to a reduction of growth) ::growth hormone, thyroid hormone, insulin {are needed to activate endocrine system and stimulate growth} growth hormone stimulates bone growth via direct and indirect binding. bind to liver and trigger the release of igf-1 {made from the liver} growth hormone stimulates bone remodelling via direct and indirect binding of igf-1. first: recruitment of osteoclasts to site for matrix resorption/bone engulfment to create cavities. next: recruitment of osteoblasts to proliferate and replace bone matrix {chewed up by osteoclasts} \gh and igf-1 can directly recruit osteoblasts for bone replacement. recruits chondrocytes to the site of gh binding. peptide hormone single chain polypeptide (~190 aas)

Related Questions

A mass m rests on a frictionless horizontal table and isconnected to rigid supports via 2 identical springs each of relaxedlength L0 and spring constantk. Each spring is stretched to a length L considerable greater thanL0. Horizontal displacementsof m from its equilibrium position are labeled x and y.

(Diagram insert didn't work, all it really tells you is that xis on the axis of the springs and y is perpendicular to thesprings)

a) Write down the differential equation of motion (i.e.,Newton's Law) governing small oscillations in the xdirection.

b) Same as a but in the y direction (assume that y <<L).

c) In terms of L and L0, calculate the ratio of the periods ofthe oscillations along x and y.

d) If at t=0 the mass m is released from the point x = y = A0with zero velocity, what are its x and y coordinates at any latertime t?

---------------------------

So, I started with just ma = -2kx for a, leading me to thedifferential equation x''(t) + (2k/m) x = 0.

Then I did basically the same thing with y.

However, when I get to c, there's my problem - I don't knowhow I could write any of this in L and L0.

Also, b doesn't really make sense to me because if y is smallwhen compared to L, it seems like there shouldn't be anyoscillation in the y direction.

The answer the back of the book shows for c and d are:

c) Tx/Ty = (1 - L0 / L)1/2

d) x(t) = A0cos( (2k/m)1/2 t)

y(t) = A0cos( (2k(L-L0)/mL)1/2 t)

I have no idea how they got to these answers. Can somebodyhelp me? It has something to do with springs already beingstretched, but it seems they are making an assumption somewherethat I don't understand.

A block having mass m and charge +Q is connected to aninsulating spring having a force constant k. The block lies on africtionless, insulating, horizontal track, and the system isimmersed in a uniform electric field of magnitude E directed asshown in the figure below. The block is released from rest when thespring is unstretched (at x = 0). We wish to show that the ensuingmotion of the block is simple harmonic. http://www.webassign.net/serpse8/25-p-008.gif (b) What kinds of potential energy exist withinthis system? (Select all that apply.) kinetic energy gravitational potential energy elasticpotential energy electrical potential energy c) Consider the instant the block is released fromrest to be the initial configuration of the system. The finalconfiguration is when the block momentarily comes to rest again.What is the value of x when the block comes to rest momentarily?(Use any variable or symbol stated above along with the followingas necessary: π.) x= d)What is the value of x0?(Use any variable or symbol stated above along with the followingas necessary: π.)
x0=
e) Define a new coordinate system x'such that x' = x− x0. Showthat x' satisfies a differential equation forsimple harmonic motion.
f) Find the period of the simple harmonic motion. (Use anyvariable or symbol stated above along with the following asnecessary: π.)
T=
g) How does the period depend on the electric fieldmagnitude?

A magnetic field of 0.1T forces a proton beam of 1.5 mA to move ina circle of radius 0.1 m. The plane of the circle is perpendicularto the magnetic field.

47. Of the following, which is the best estimate of the speed of aproton in the beam as it moves in the circle?
(A) 10-2 m/s (B) 103 m/s (C) 106 m/s (D) 108 m/s (E) 1015 m/s

52. An ideal gas is initially in a state that corresponds to point1 on the graph above, where it has presÂ¬sure p1, volume V1, andtemperature T1. The gas undergoes an isothermal process representedby the curve shown, which takes it to a final state 3 attemperature T3. If T2 and T4 are the temperaÂ¬tures the gas wouldhave at points 2 and 4, respecÂ¬tively, which of the followingrelationships is true?
(A) T1 < T3 (B) T1 < T2 (C) T1 < T4 (D) T1 = T2 (E) T1 =T4

53. The absolute temperature of a sample of monatomic ideal gas isdoubled at constant volume. What effect, if any, does this have onthe pressure and density of the sample of gas?
Pressure Density
(A) Remains the same Remains the same
(B) Remains the same Doubles
(C) Doubles Remains the same
(D) Doubles Is multiplied by a factor of 4
(E) Is multiplied by a factor of 4 Doubles

62. A sample of an ideal gas is in a tank of constant volume. Thesample absorbs heat energy so that its temperature changes from 300K to 600 K. If v1 is the average speed of the gas molecules beforethe absorption of heat and v2 is their average speed after theabsorption of heat, what is the ratio v2/ v1 ?
(A) 1/2 (B) 1 (C) (D) 2 (E) 4

63. Two people of unequal mass are initially standing still on icewith negligible friction. They then simulÂ¬taneously push each otherhorizontally. Afterward, which of the following is true?
(A) The kinetic energies of the two people are equal.
(B) The speeds of the two people are equal.
(C) The momenta of the two people are of equal magnitude.
(D) The center of mass of the two person system moves in thedirection of the less massive person.
(E) The less massive person has a smaller initial acceleration thanthe more massive person.

64. Two parallel conducting plates, separated by a distance d, areconnected to a battery of emf e. Which of the following is correctif the plate separaÂ¬tion is doubled while the battery remainsconnected?
(A) The electric charge on the plates is doubled.
(B) The electric charge on the plates is halved.
(C) The potential difference between the plates is doubled.
(D) The potential difference between the plates is halved
(E) The capacitance is unchanged.

68. A rod on a horizontal tabletop is pivoted at one end and isfree to rotate without friction about a vertical axis, as shownabove. A force F is applied at the other end, at an angle ? to therod. If F were to be applied perpendicular to the rod, at whatdistance from the axis should it be applied in order to proÂ¬ducethe same torque?
(A) L sin ? (B) L cos ? (C) L (D) L tan ? (E) L

70. A 4 ÂµF capacitor is charged to a potential differÂ¬ence of 100V. The electrical energy stored in the capacitor is
(A) 2 x 10-10 J (B) 2 x 10 8 J (C) 2 x 10 6 J (D) 2x 10-4 J (E) 2 x10-2 J

PSL201Y1 Study Guide - Final Guide: Thyroglobulin

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