What is an organ?

Question

a group of cells doing the same kind of work
a group of cells doing different work
both 1 and 2
neither 1nor 2

Answer 1

Both 1 and 2.

Organs are made up of tissues. Each tissues are made up of its cells. So, the answer is both.

Take for example the skin. It contains all 4 different types of tissues. The Epithelial tissue will do its work by protecting us from foreign invasion, the nervous tissue would signal any pain or sensation to our brain. So on and so forth. Each of them have their own respective stuffs to do.

Hence the whole group would mean all different types of cell working respectively in a unison to give us the organ.

Answer 2

I am going to disagree with the consensus and opt for "neither 1 nor 2"

An organ is defined as a group of tissues. Even within a single organ, there are tissues performing completely unrelated tasks- two obvious examples of this would be the pituitary and the pancreas.

The pituitary can actually be subdivided into up to six seperate parts depending on the cell types- however, there is no interaction between the cells or hormones. Similarily, the pancreas' main job is the production of proteolytic enzymes, though there are large islets that are involved in regulating blood sugar and have nothing to do with proteolysis.
Taking the options you have even further literally and picking a much simpler organ, this is still incorrect to say they are doign the same kind of work. Look at the colon for instance- there are the absorptive epithelial cells who only worry about absorbing water and water soluble nutrients. There are goblet cells that only care about secreting mucus to lubricate the GI track. There are nerve cells and muscle cells that have nothing to do with absorption or lubrication and only worry about peristalsis, etc.

It is a terribly phrased question, but there is no way I could count 1 as correct. 2 is closer to reality, but, there are cases where there are several cell types all doing the same type of thing (e.g. APUD cells, epidermal cell populations). If for whatever reason it isn't "neither 1 nor 2", you have will have a REALLY strong argument against it (barring something stupid like it being word for word in the textbook, which still doesn't make it right)

Answer 3

1

Answer 4

it is a group of cells doing the same kind of work

Organ a group of tissues that perform a specific function or group of functions. Usually there is a main tissue and sporadic tissues. The main tissue is the one that is unique for the specific organ. For example, main tissue in the heart is the myocardium, while sporadic are the nervous, blood, connective etc.

Answer 5

An organ begins as you said a group of cells carrying out similar functions, but there is another step you missed, the group of cells forms a tissue it is a group of tissues carrying out similar functions which makes an organ. so it goes cells-tissues-organs-organ systems- organism.

Answer 6

A distinct part of an organism that performs one or more specialized functions. Examples of organs are the eyes, ears, lungs, and heart of an animal, and the roots, stems, and leaves of a plant.

Answer 7

Generally a group of cells that carry out a limited number of specialized functions, such as

heart
liver
brain
.
.
.
.
.

Answer 8

it is group of cells doing the same kind of work
BUT it should be groups of tissue

Answer 9

none of the answer.