207. All of the following are characteristics of smooth muscle EXCEPT a. they have spontaneous city in the absence of nerve stimuli
b. nerves modily the activity rather than initiate it
c, nerves initiate the activity rather than modify it
X d, two varieties are recognized depending on terve supply
o they are supplied with parasympathetic and sympathetic nerves.
Are smooth muscles supplied by parasympathetic and sympathetic nerves

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

How many major plates cover the earth

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.