Vagus and accelerator
sinoatrial node
Lyme disease and syphilis are two bacterial diseases that affect nerves.
texture composition
by the rate of population, types, habitats, and the numbers decreasing.
The primary injuries that affect the muscular system are strains and sprains. But inflammation and irritation of nerves is the biggest source of pain after injury.
force and speed
The two phases of the heartbeat are systole (contraction phase) and diastole (relaxation phase).
Thyroxine and Triiodothyronine
The two types of peripheral nerves are somatic and autonomic nerves.
The conflict in the book heartbeat is about the two protagonist. The two protagonists support different political sides and ideas.
The properties of reactants (reactivity) and catalytic behaviour
Rock chemistry, and size. Temperature and wind.