In arteriosclerosis, hardened arteries cannot expand to handle the blood that enters the vessel when the heart contracts. therefore, pressure in the artery and causes the heart to work
a) increases, more
b) decreases, less
c) decreases, more
d) increases, less

A. pressure increases in the artery and causes the heart to work more

When the artery cannot expand the pressure builds up in the smaller space that remains.  As the pressure builds, the heart has to work harder to push the same amount of blood through that smaller opening.

Hope that helps.

Ihaven't done that yet, so no idea,but this is not the right place to ask

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.