100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
BTEC APPLIED SCIENCE UNIT 9B - DISTINCTION £7.06
Add to cart
Quickly navigate to
Preview
  2.  
  3. PEARSON (PEARSON)
  4.  
  5. Applied Science 2016 NQF
  6.  
  7. Unit 9 - Human Regulation and Reproduction

Essay

BTEC APPLIED SCIENCE UNIT 9B - DISTINCTION

 3 purchases

Distinction assignment from BTEC Applied Science Unit 9- human regulation and reproduction. unit 9B includes how homeostatic mechanisms maintain normal function, as well as an explanation of the roles. It also includes an analysis of the impact homeostatic dysfunction has on the body.

Preview 2 out of 18  pages

Document information

  • June 22, 2024
  • 18
  • 2023/2024
  • Essay
  • Unknown
  • A+

Subjects

Written for

All documents for this subject (95)

Seller

avatar-seller
usaydali

Reviews received

Content preview

Homeostasis
Homeostasis is the process where the body maintains a stable internal environment. This
causes dynamic equilibrium in the body. PH, temperature, blood glucose concentrations, and
salt concentrations all need to be regulated to ensure cells can function efficiently without
being harmed. Our body would not be able to survive without homeostasis. The nervous
system and hormones are involved in ensuring there is dynamic equilibrium in the body.
They do this with the help of receptors that detect the stimuli and cause a response which
brings it back to normal. It is important to control the internal temperature in the body as
the metabolic processes in the body are faster at higher temperatures. If the temperature is
too cold, the enzymes will not have sufficient kinetic energy to be able to move around and
collide with the substrate. Due to their not being a high number of successful collisions, the
enzymes are unable to sped up processes in the body. This will result in bodily processes
occurring much slower and less efficiently. However, if the temperature increases too high,
enzymes in the body can become denatured. When an enzyme becomes denatured, it loses
its tertiary structure which means the substrate will no longer fit the enzyme as the active
site has changed shape. It is important to control blood glucose concentration as glucose is
required to carry out respiration in the body. If the levels are too low, then cells will not be
able to respire, and if the levels are too high, water molecules will diffuse out of cells into
the blood due to the water potential being too low. It is important that water/salt
concentration is regulated because if it is too high, cells will swell and burst as they will get
flooded with water. If the concentration is too low, the cells will shrivel and die as water will
be leaving the cell causing them to be dehydrated.
Negative feedback
Negative feedback is a mechanism by
which homeostasis is achieved. A
change in one condition of the body
causes the effector to bring the change
back to normal. If there is a change in
the body, the specific receptor would
detect the change and generate an
action potential that would travel to
nervous system or hormonal system
where a response is coordinated. From
here, the impulse would travel to the effectors where a response will occur to bring the
change back to normal. This could be a change in temperature, PH, or salt concentration in
an organ in the body. The average bodyphj temperature is 37 degrees. When exercising, the
body temperature increases above 37 degrees as the muscles in the body are working
harder. Thermoreceptors in the body detect this change and generate an action potential
that travels along the sensory neuron to the hypothalamus. The hypothalamus coordinates a
response and releases hormones. This causes the sweat glands to release sweat. This causes
the bodies temperature to return back to normal (37 degrees).

, Positive feedback




Positive feedback is another mechanism; however, this does not cause homeostasis. During
positive feedback, when there is a change in the body, the effectors create a response to
amplify the change in the body rather than returning it back to normal. This is useful during
childbirth as when the cervix stretches and dilates, the stretch receptors send a nerve
impulse to the pituitary gland where the hormone oxytocin is released. This hormone causes
the uterus to contract harder to try and force the baby out. The cervix stretches and dilates
due to the baby's head pushing against it.




Exocrine glands
Exocrine glands are glands that secrete enzymes and different substances. These glands have
ducts and secrete substances to the site of action rather than into the blood. This causes
exocrine glands to have a faster response, however, they have short term effects on the
body. salivary glands, Brunner’s glands and sweat glands are all exocrine. Sweat glands are
located on the skin, and they secrete sweat to lower the body temperature. This occurs
when exercising as the body's temperature increases. The Brunner’s glands are located in
the duodenum of the small intestine. The function of this gland is to neutralise the stomach
acid. It does this by secreting alkaline mucus which is high in PH. This neutralises the acid
which protects the mucosa from being damaged.

Endocrine glands
Endocrine glands are glands that secrete hormones into the bloodstream. They are like
exocrine glands; however, they do not have ducts and have a much slower response. The
response is slow, but the effect is more long term. The hypothalamus, pituitary gland,
thyroid, and parathyroid gland are all different types of endocrine glands. The thyroid gland

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller usaydali. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £7.06. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

65539 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now

Start selling
£7.06  3x  sold
  • (0)
Add to cart
Added