AP2 Final

Paracrines are

Local hormones which have their effect on the neighboring cells

Important in metabolism of carbohydrates

Part of endocrine system important in metabolism

Hormones which are synthesis from platelets

Most of the hormones are

Chemical substances secreted by all the cells in the body

Synthesized from amino acids and steroids

Chemical substances which binds to endoplasmic reticulum and increase the synthesis of lipids

Only effect the target cells at the cell membrane surface

All of the above

Average half life of hormones in the blood is usually brief from fraction of

Minutes to 60 minutes

Seconds to one minute

A day to 30 days

Hour to one day

The sinoatrial (SA) node region of the right atrium is the normal pacemaker of the heart because this region

Demonstrates spontaneous electrical activity

Depolarizes to threshold after other cardiac regions

Has a very long lasting action potential

All of the above

Which of the following correctly describe the difference between the circulating hormones and local hormones?

The circulating hormones have a shorter half life compared to local

The circulaing hormones have their affect on the neighboring cells but locals do not

The circulating hormones are not present in the blood but local hormones are

The circulating hormones have a longer half life compared to local

None of the above

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