Human Anatomy

I am a little confused about the action potential concept (see nervous system)

I have 3 multiple-choice questions that I need help with. I have studied the topic using the textbook and the Internet. Please don't send me to websites; just tell me if my answers are correct.

Which is the correct sequence of events that follows a threshold potential:
1.the membrane becomes depolarized
2.sodium channels open and sodium ions diffuse inward
3.the membrane becomes repolarized
4.potassium channels open and potassium ions diffuse outward while sodium is actively transported out of the cell
A)3,2,4,1

ihave some problems to ask. can anyone tell me about how to create human DNA that content animal DNA.

I need to know about the dorsal side of hte human heart.The dorsal includes the right and left branches of the pulmonary artery, superior and inferior vena cava, pulmonary veins, and, left and right atria ventricles. I was wondering if i can get all the Info about those parts? thanks

hi. i am a new member to this site,i am not a medical student,and dont have very much medical knowelege.i got this site from google,and i am looking for urgent help as my granddaughter is in hospital for over a month and the doctor,s cannot find out what her problem is,she is only 3 years old,she has fluid leaking into her body that has gone around her heart,has swelled her tummy and face,keyhole surgery has been done to drain it from the heartlast week,and today surgery has been done on her tummy,but the doctor,s do not know where it is comeing from or what it is.we have been told it might be a leakage in her bladder but the doctor,s said no they checked for that but would check again by m.r.i.

Hi Everyone

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