Hormones:the first step
Hormones are substances that are increted into blood vessels that have
certain producing glands and target glands, and produce a certain amount
of effects with small quantities.
What hormones are
For example, female sex hormone can be defined as a hormone because its
producing gland is clear (ovary)and the target gland is also clear (female
reproductive system). Also, it produces a cerain of effect with small quantity
which is sexual development.
On the other hand, glucose secreted to the bloodstream from the liver cannot
be defined as a hormone. It doesn't have a certain target organ nor produce
a certain effect, since it is an energy-providing substance. Plus, its
quantity is large.
1. Glucose is a hormone secreted internally by liver. [ a. right / b. wrong
2. Antibodies are secreted to the bloodstream from plasma cells, and attack
bacteria. Antibody is a hormone. [ a. right / b. wrong ]
3. Aldosterone is produced from adrenal cortex in small quantity, and it
has an effect of increasing the speed of sodium pumps of uriniferous tubule
in kidney. Aldosterone [ a. is / b. is not ] a hormone.
1.The correct answer is b. It is secreted to the bloodstream, but not in
small quantity. Also since it is energy-providing substance, it doesn't
have a clear target organ. Considering these points, can we call it a hormone?
2.The correct answer is b. A bacteria is a foreign body and thus not considered
to be a target organ. Antibodies aren't considered to be a hormone.
3.The correct answer is a. It is secreted to the bloodstream, and has a
clear producing gland and a clear target organ, eliciting a certain effect
in small quantity. It can be considered to fulfill the definition of a