Asked By Hannah... Please Help!!!

Are nerve impulses and electrical pulses the same thing?

How the structure of capillaries is designed for efficient exchange of materials between the blood and the cells of the tissues

Explain electrical activity within the heart that co-ordinates the cardiac cycle

if you get a C in your coursework for additional science what do you need in your exam to overall get a B or an A? Thanks.

Hi Can someone give me an easy explanation of how to understand working out half lives for this question: Zircon crystals found to have a 207 Pb/235U and ratio of 0.55. calculate the age of the crystals? please note i am not asking for the answer just to be shown how to calculate it in an easy way please as i am abit confused by my papers, i have started to calculate it but then think i work it out wrong, thank you.

A ship travels at a constant speed of 25 kilometres per hour (Kph) in a straight line from port A located at position (x_A, y_A) =(-100, -100) to port B at (x_B ,y_B )=(300 ,100). A) Find parametric equation for the line of travel of the ship .your equation should be in terms a parameter t, and should be such that the ship is at port A when t=0 and at port B when t=1.

(b) During its journey ,the ship passes two lighthouses ,L_1 and L_2, which are located at positions (0,0) and (200.0), respectively. (i) write down expressions ,in terms of the parameter t of part (a) ,for the squares d_12 and d_22 of distances between the location of the ship at parameter value t and the lighthouses L_1 and L_2 respectively .Simplify your results. (ii) Completing the square for your result for d_12: d_12=200000((t- 3/10)2 + 1/100) Explain how d_1 varies as t increases from 0 to 1 .Determine the shortest distance between the ship and the lighthouse L_1, to the nearest kilometre

How does a guitar (acoustic) make its sound louder?

How many joules in a million tons of natural gas?