What is the sequence for?
<span>Cardinal are altricial birds. That means this beautiful male cardinal was born without feathers, with its eyes closed, and relied on his parents to feed him and teach him how to fly. The changes from the hatching cardinal to the adult you see here can BEST be described as?
A. </span><span>growth and development.</span>
Answer:
E. All of the above
Explanation:
In cardiac contractile cells there is rapid depolarization, then a plateau phase and repolarization.
when an action potential stimulates the cell, voltage-gated channels open quickly commencing the positive-feedback mechanism of depolarization. This in turn raises the membrane potential to approximately +30 mV, and this closes the sodium channels. Next comes the plateau phase, where membrane potential declines relatively slowly due to the opening of the slow Ca2+ channels, allowing Ca2+ to enter the cell while few K+ channels are open, leading to K+ to exit. Once the membrane potential reaches approximately zero, the Ca2+ channels close and K+ channels open, allowing the exit of K+. The repolarization lasts approximately for a while and here is when the membrane potential drops until it reaches resting levels once more and repeats the cycle.
This is of course true - the only thing that really affects your health (and is at the same time everything that affects it) is the environment and a personal's genetic makeup.
Out of all of the following, i believe D is the best answer.