Answer:
Key points
Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive.
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems.
The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
The survival of the organism depends on the integrated activity of all the organ systems, often coordinated by the endocrine and nervous systems.
Introduction
If you were a single-celled organism and you lived in a nutrient-rich place, staying alive would be pretty straightforward. For instance, if you were an amoeba living in a pond, you could absorb nutrients straight from your environment. The oxygen you would need for metabolism could diffuse in across your cell membrane, and carbon dioxide and other wastes could diffuse out. When the time came to reproduce, you could just divide yourself in two!
However, odds are you are not an amoeba—given that you're using Khan Academy right now—and things aren’t quite so simple for big, many-celled organisms like human beings. Your complex body has over 30 trillion cells, and most of those cells aren’t in direct contact with the external environment.^11start superscript, 1, end superscript A cell deep inside your body—in one of your bones, say, or in your liver—can’t get the nutrients or oxygen it needs directly from the environment.
How, then, does the body nourish its cells and keep itself running? Let's take a closer look at how the organization of your amazing body makes this possible.
I hope it helps you ✌
Drug abuse can effect your body in a very bad way and their are very bad side effects you can get by using drugs such as <span>increased heart rate, high blood pressure, dizziness, tremors, mood changes and paranoia.</span>
“When you last renewed your driver's license, you may have checked the box to become an organ donor. Or you may have skipped it. And you may have chosen either option without thinking about it too much, or without truly understanding the decision you were making.
Choosing whether to be an organ donor is certainly a personal decision, but it really is a heroic one - and one that you, as an individual, can make on your own.
"In many ways, being an organ donor is one of the greatest gifts you can give," said Dr. Michael R. Marvin, director of transplantation and liver surgery for Geisinger. "It's a very selfless act because you most likely won't know the recipients, but by choosing to donate, you are saving or improving the lives of many people."
One organ and tissue donor can save and enhance the lives of up to 50 people. An organ donor can give a second chance at life to up to eight people. Through tissue donation, a donor can enhance the lives of countless others through bone donations to repair fractures and prevent amputations, skin donations to heal burn patients and heart valve donations to repair life-threatening defects. Donors can also donate their corneas, which can give the gift of sight to recipients.
Last year, more than 30,000 organ transplants were performed in the United States.
"Even with all of our success, there is still work to do in educating the public about the critical need to register more organ and tissue donors," Dr. Marvin said. "The statistics are frightening. Currently in the United States, 21 people on average die each day because there aren't enough life-saving organs available for transplant."
According to the Gift of Life Donor Program, over 8,400 Pennsylvanians are waiting for a life-saving organ transplant. Residents who have a driver's license or state identification card can go online and add the donor designation to their record. You can also register online at www.donors1.org.
"You no longer have to wait until you renew your driver's license or state identification card. It's a quick and easy process to register online," Dr. Marvin said.” Sorry for the top guy hope this helps can you mark me brainiest?
You could talk about how you like helping people in it, maybe put in something like “ever since i was little, i have wanted to help others. i want to have a positive impact on the lives of others, which is why i want to be a nurse - i would love to help those in need and change their lives.”
