Reflexes: involuntary response, always the same, is rapid, with no awareness of the reflex before it happens. 

Tight junctions are tiny, fluid-filled tunnels which allow flow of ions between cells in cardiac muscle.

Sodium ions are found in the extracellular fluid and the potassium ions are found in the intracellular fluids  

Where are synaptic knobs located? 

Gyri = depressions between ridges and Sulci = ridges   

Of the four stages in cellular respiration, which involves the transfer of electrons from NADH and FADH2 to make ATP?

The presence of mitochondria facilitate aerobic respiration in muscle cells

To complete aerobic respiration all food must be eventually be broken down to glucose.

During citric acid cycle (aka Krebs cycle)

This material ranges from viscous to solid and makes up an important component of connective tissue: