Wednesday, June 9, 2010

Our Body Work as a Team?

What Does "Tissue" Mean, and Do the Tissues Throughout Our
Body Work as a Team?
Humans are truly a complex array of organs and other tissues designed
to support the basic functions and vitality of our body. We are able to
process inhaled air and ingested food and regulate body content. We
selectively take what we need from the external environment and elimin-
ate what we do not need. We think, move about, and reproduce. Many of
these operations occur without us even being aware of them.
 One other term we should be familiar with is tissue. Quite
simply, tissue is composed of similar or cooperating cells performing
similar or cooperative tasks. These cells may be grouped together to form
fascinating tissues such as bone, skin, muscle, nerves, and blood.

Tuesday, June 8, 2010

Extracellular Fluids?

What Types of Substances Are Found in the Intracellular and
Extracellular Fluids?
In our body fluids we would find small dissolved substances such as ions,
amino acids, and the carbohydrate glucose, as well as larger proteins. The
major ions (or electrolytes) would include potassium (K+), sodium
(Na+), chloride (Cl−), calcium (Ca2+), magnesium (Mg2+), phosphate
(PO43−), and bicarbonate (HCO3−). As demonstrated in Figure 2.2, all of
these and other substances will be found in both the intracellular and
extracellular fluids. However, the concentration of substances dissolved
in either fluid varies and the plasma membrane is bestowed with the
awesome responsibility of functioning as a barrier between the two
mediums.

Sunday, June 6, 2010

Free radicals are molecules

The presence of free radicals in our body is not necessarily a disease and
seems to be unavoidable. That's because free radicals are normally pro-
duced when we breakdown carbohydrates, protein, and fat for energy.
Furthermore, certain immune processes purposely generate free-radical
substances to attack foreign entities or debris in our body. However, free
radicals can certainly lead to disease if their presence becomes too great
and they are left to their own devices. This tends to happen when we
allow free radicals access to our body via the foods we eat and the
substances we breathe. Cigarette smoke is loaded with free-radical sub-
stances, probably more than one hundred different kinds.
   Free radicals are molecules that can take electrons from other
   molecules thereby causing damage.
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