metabolism activity case study


Energy and Life

Energy is defined as the ability

to do work; all living things

require some level of energy

to keep them alive. The source

of energy is from the sun as

we are part of the solar

system. Living things have

different abilities in using this

energy in what is known as

metabolism activity. This

represents a sum of all

chemical reactions that take

place in living organisms and

result in the energy process. This energy can be used for all

different activities including growth, movements, and


Metabolism is composed of catabolic and anabolic reactions.

Catabolic means the breakdown of macromolecules into

basic building blocks. Anabolic means using the materials

that resulted from the breakdown to rebuild the new


Living things are divided regarding metabolism into different


1. Autotroph – represents those organisms that can

produce their own food, because; they have the ability

to perform photosynthesis capturing the sunlight and

converted into stored chemical energy in food.

2. Heterotroph – organisms that can’t make photosynthesis

and depend on produced foods.



3. Decomposers – the last group that is responsible to

recycle all the materials.

The energy level is conserved between these three levels of

living organisms.



Homeostasis is a very

important concept of life, this

means staying within a level

of constant (staying the

same). Living things are part

of the ecosystem and that

means they have some kind of

interactions and changes, they

will never stay exact at all

times. This mechanism allows

them to adjust and come back

to the previous point. The

changes represent internal

and external causes that if not correct will cause harm to

the organs.

Homeostasis is a mechanism that has several components

to be functional.

First, it required a cause which is called a stimulation such

as a temperature or level of glucose in the blood, this has to

be detected by receptors and reported to a control center in

the nervous system where the information will be processed

and a design will be established and the order is carried to

target or effectors how will respond and make the

adjustments such as sweating.



Let us look at the example of temperature. If you stand

outdoors and the weather temperature is 105, heat will start

to go into your body if this continues your internal

temperature will be equal to the environment, this does not

happen because receptors in your skin detect this and

report to the hypothalamus, the hypothalamus sends orders

to targets, as a result, you will notice increase heart rate,

increase respiration, increase urination, and sweating this

will keep your body temperature the same. This is known as

the negative feedback loop, homeostasis also uses a

positive feedback loop in some conditions such as childbirth.

"Is this question part of your assignment? We can help"