Organ systems of the human body interact to maintain a balanced internal environment. As blood flows through certain organs of the body, the composition of the blood changes because of interactions with those organs. The composition of blood is basically whats in the blood. The blood changes composition constantly when oxygen is being released into cells and carbon dioxide is being eliminated from the cells into the blood. i'm not sure about the digestive system. maybe the molecules get broken down? <span>
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Answer:
There are four classes of macromolecules (polysaccharides or carbohydrates, triglycerides or lipids, polypeptides or proteins, and nucleic acids such as DNA & RNA). Carbohydrates and lipids are made of only carbon, hydrogen, and oxygen (CHO). Proteins are made of carbon, hydrogen, oxygen, and nitrogen (CHON).
Answer:
carbon dioxide, salts, urea, and uric acid
Answer:
Tubular re-absorption is the second major step in urine formation. Most of the re-absorption of solutes necessary for normal body function, such as amino acids, glucose, and salts, takes place in the proximal part of the tubule.
Explanation:
Group 15 is called the nitrogen group. The first two elements in this group are nonmetals. These are followed by two metalloids and one metal. All the elements in the nitrogen group have five valence electrons, but they vary in their reactivity.