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Justin M.
Recent graduate from Eckerd College with a Bachelor's in Biology
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Biology
TutorMe
Question:

What is the QRS complex on an ECG reading?

Justin M.
Answer:

The QRS complex corresponds to the depolarization of the right and left ventricles of the human heart.

Biology
TutorMe
Question:

Generally speaking, what is the process of glycolysis?

Justin M.
Answer:

Glycolysis is the metabolic pathway that converts glucose into pyruvate. In the process, the free energy released is used to form the high-energy compounds ATP (adenosine triphosphate) and NADH (reduced nicotinamide adenine dinucleotide). Glycolysis is the first step in the process of cellular respiration. The created pyruvate molecules are then converted into acetyl-coenzyme A which is used for the next step of cellular respiration, the Kreb's cycle.

Anatomy
TutorMe
Question:

What happens when a muscle contracts?

Justin M.
Answer:

Sodium ions enter the muscle cell which creates an electrical impulse that travels down the cell membrane. This impulse travels to an indentation of the membrane called a T-tubule. This allows the impulse to reach an intracellular structure called the SER(Smooth Endoplasmic Reticulum) which releases Calcium ions into the cell. The Calcium ions bind to fibers inside the cell called actin and myosin which become attracted to each other generating tension through the action of these fibers cross-bridge cycling.

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