How does the structure of the sarcomere change during a contraction?

Order the following bonds in order of increasing strength: polar covalent, hydrogen (single only), nonpolar covalent, ionic.

The site at which a motor neuron meets a muscle fiber is known as what? 

In a(n) ____________ solution, there is a higher concentration of solutes in the solution outside of the cell than within the cell, leading it to dehydrate and shrivel.

Which of the following statements is true of the parasympathetic but not the sympathetic divisions?

The __________ region of the brain houses the hypothalamus, thalamus, and pineal gland.

Energy for the first few seconds (up to a minute’s worth) of muscular activity is provided by which metabolic processes?

Which cell organelle is responsible for the production of ATP?

A small, boxy bone that is as wide as it is tall fits into which category of bone?  

Vitamin _____ is vital to the health of the skeletal system, as it is converted into calcitriol which encourages the absorption of calcium and phosphorus from the diet. It is produced in the integument with exposure to sunlight.