Tutor profile: Chandler M.

Briefly explain the Christian belief of the Holy Trinity.

Orthodox Christians believe God is one God in three divine Persons. This belief is based on passages in the Bible that imply the Trinity such as in Genesis when God says "let us make man in our image". The three Persons are the Father, the Son (Jesus Christ), and the Holy Spirit. All three Persons are considered to be equally God, but there are distinctions between each Person. So while both the Father and the Son are both equally God, the Father is not the Son nor is the Son the Father. This is seen when Jesus prays to his Father in the Gospel accounts in the New Testament.

What role does oxygen play in aerobic cellular respiration? Explain.

Oxygen is the final electron acceptor in aerobic cellular respiration. Explanation: After glycolysis and the Krebs cycle comes the highly productive electron transport chain. In this part of aerobic cellular respiration, electrons of hydrogen molecules are passed through a series of "gates" to produce ATP (adenosine triphosphate). Think of it like a hydroelectric dam where the flow of water is used to create electricity. Once the electron has passed through all the "gates" it needs somewhere to go to prevent it from lowering the pH of its environment. The solution is oxygen which accepts two electrons per atom of oxygen forming a water molecule (H20).

Describe the sliding filament theory of muscle contraction?

Once a motor neuron sends a signal to a muscle to contract, stored calcium is released into the sarcomere (which is the smallest area muscle function can be observed) where the calcium binds to a protein called troponin. Troponin sits on the thin muscle filament (known as actin) and is connected to another protein called tropomyosin. When the calcium binds to troponin, both troponin and tropomyosin change positions allowing the heads of the thick muscle filament (known as myosin) to interact with the actin. As long as calcium is present, the myosin heads can interact with actin. (I can elaborate on any specific point in here as well as talk about how myosin heads cycle with the presence of ATP as needed)