In mitochondrial electron transport, what is the direct role of o2? to provide the driving force for the production of a proton gradient to provide the driving force for the synthesis of atp from adp and pi to oxidize nadh and fadh2 from glycolysis, acetyl coa formation, and the citric acid cycle to function as the final electron acceptor in the electron transport chain

To function as the final electron acceptor in the electron transport chain

Explanation:

Cellular respiration is the process by which cells degrade food molecules to obtain energy in the form of Adenosine Triphosphate (ATP).

Respiration comprises the following steps:

Glycolysis (oxidation of glucose to pyruvate)

Acetyl-CoA formation.

Krebs cycle.

Electron transport chain and oxidative phosphorylation.

Glucose oxidation processes reduces NAD+ to  NADH and FAD+ to FADH, these molecules accepts electrones produced when glucose is oxidized.

The electrons accepted by NADH and FADH then pass through a series of electron transporters, going from a high energy level to a lower one.

Finally, oxygen is the last electron acceptor, which combines with 2 protons (hydrogen ions) and forms water.

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.