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    Why do teenagers often experience acne?

    Acne results from a blockage of sebaceous glands by sebum. The blockage causes blackheads to form, which are susceptible to infection. The infected tissue then becomes red and inflamed. Teenagers experience this at high rates because the sebaceous glands become active during puberty. Hormones that are especially active during puberty stimulate the release of sebum, leading in many cases to blockages.

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Questions & Answers

why are cells small
Hajiahamdy Reply
what is the change if take normal water in our body
Algur Reply
What are variations in physiology
John Reply
pls let's talk about d difference between mitosis and meiosis
olatemiju Reply
through remodeling and formation of new bones
Amoako Reply
please what is it
Monica
what is blood pressure
HALLELUYAH
what is blood pressure reading
HALLELUYAH
sketch and label blood vessels
HALLELUYAH
veins is........
KING
draw the male reproductive system
Jeremaih Reply
hello am new here
Pednyin
how life
Jeremaih
join
Hajiahamdy
Explain how different foods can affect metabolism
Abraham Reply
what is Endocrine system?
Islam Reply
which secrete hormones and other products direct into the blood
Aadi
Cell is basic, structural and functional unit of life
Kabuja Reply
The cell is the structural and functional unit of all living organisms, and is sometimes called the "building block of life." Some organisms, such as bacteria, are unicellular, consisting of a single cell.
Br_
hi am new here..wish to join you in this conversation
Rachel
welcome Rachel am Brianito
hingi
hey
HALLELUYAH
can some one help
HALLELUYAH
what is the basic function of the lymphatic system
HALLELUYAH
The other main function is that of defense in the immune system. Lymph is very similar to blood plasma: it contains lymphocytes. It also contains waste products and cellular debris together with bacteria and proteins. Associated organs composed of lymphoid tissue are the sites of lymphocyte producti
Adnan
the function of lymphatic system are 1fluid balance 2 lipid absorption and 3 defence
Sidra
destroyed microognism
Usman
lymphatic systems main function is to transport lymph
Colleen
may i know the meaning of infestation of parasite?
Aminiely
Which of the following accurately describe external respirations
Robin Reply
different between anatomy and physiology
Samwel Reply
anatomy is the study of STRUCTURE of the body while physiology is the study of the function of the part of the body
Gborgbor
Anatomy deals with the structure and parts of the body while physiology is the function of the the body parts
Archie
not understanding what is a cell
Kesa Reply
its the fundamental unit of life or its the primary step in which two or more cell combine to form a tissue .
Sidra
Is the smallest structural and functional unit of life
Aliyu
cell is the basic you unit of life
Esther
what is osteomalàcia
Ellen Reply
what is hydroxyapitate
Ellen
Hydroxyapatite, also called hydroxylapatite, is a naturally occurring mineral form of calcium apatite with the formula Ca₅(PO₄)₃, but it is usually written Ca₁₀(PO₄)₆(OH)₂ to denote that the crystal unit cell comprises two entities. Hydroxyapatite is the hydroxyl endmember of the complex apatite gro
Br_
..up
Br_
what's the best way to memorize the terms and what it does
Kesa
osteomalacia is where inorganic or mineral which is calcium and phosphorus are removed from a bone....this will make the bone become flexible n in children is called ricket
Rashida
wat work does anatomy do in the hospital and can they get work fast after finishing
SULE Reply
what is the meaning of suture?
praba Reply
it is a protective layer of brain
Madhureddy
it is a kind of non movable joint present between skull bones
neha
suture is an example of fibrous joint and is synatrosys(is not movable)
Rashida
a junction between the sclerites of an imsect's body
Aadi

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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