Discuss the importance of calcium ions and the detailed mechanisms they are involved in from when the action potential reaches the end of the neuron at the neuromuscular junction to the completion of the contraction of a muscle. Discuss in full detail how all the proteins in the structure of the muscle fibre function in contraction and why calcium ions are so important in the control. (15marks)

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

What molecule contains an organisms genetic material, passed down from parents to their offspring

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.