Other
assignment 1 bio 235 grade received 98%
the assignment covers the first chapter all through the 10 chapters which are the same chapters that will be in the first midterms.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
Content preview
Acknowledgement of Academic ResponsibilityAnswers to assignment questions must be original; that is, you must write them all yourself. You can base your
answers on information in the course textbook or other sources, but if you use sources other than the textbook,
you must cite them appropriately.
Plagiarism is a form of academic misconduct that has serious consequences. It is your responsibility to read and
understand the statement on Academic Integrity in the Student Manual and the Student Academic Misconduct
Policy in the AU undergraduate Calendar. If plagiarism is detected, and if an investigation concludes that you
must rewrite the assignment, then your assignment grade will be reduced by 20 marks.
“By filling in my name and ID number below, I acknowledge my responsibility to academic integrity and
confirm that none of the wording in my answers has been copied or plagiarized in any way from any
source.”
Student’s name: Colombe kanku
Student's AU ID number: 3418750
NOTE: The assignment will not be marked if it is submitted without the above two lines filled in.
Assignment 1 :: Biology 235: Human Anatomy and Physiology 1
, Assignment 1
Weight: 5%
Minimum Pass Grade: 50%
Each question is worth 10 marks.
1. Maintenance of calcium ion homeostasis is critical to neurological, cardiac and skeletal muscle function.
Consider the roles of two hormones involved in the regulation of the concentration of calcium ions in the
blood. Parathyroid hormone increases the concentration of calcium ions in the blood, while calcitonin
decreases the concentration. Based on this information predict the body’s response to restore calcium
balance if a person swallowed 100 antacid tablets made of a calcium compound in 10 minutes. Include in
your answer the definition of homeostasis, the type of feedback loop involved and all of the components of
a feedback loop.
Homeostasis occurs when the body achieve equilibrium in the body’s internal environment due to
constant interaction of the body’s many regulatory processes. Homeostasis is a dynamic condition
and the balance can shift along a narrow window that is compatible with life. Homeostasis is
constantly being disrupted and rely on the responses of the body to return it to normal. Although
there are many regulatory system, most often it is the nervous and endocrine system that are
involved in returning the body to normal either individually or as a team. The body uses feedback
system to maintain homeostasis. A feedback system is a cycle of events in which the status of a body
condition is monitored, evaluated, changed, monitored reevaluated until equilibrium is achieved. The
main components of feedback system are receptor, control center and effector. A stimulus will cause
a change to the controlled condition, the receptor will notice this and alert the control center, the
control center will tell the effector what to do, the effector will elicit a response. These components
are what maintain equilibrium.
In this case, the level of calcium ion in blood normally stays between a narrow range to maintain
homeostasis. Multiple negative feedbacks systems will be involved in the situation described above.
Including hormones such as calcitonin, parathyroid hormone and calcitriol to maintain the balance of
calcium ion level in blood. The function of calcitonin is to decrease blood calcium ion level. The
function of parathyroid hormone is to increase blood calcium ion level. Lastly, the function of
calcitriol is to decrease calcium absorption from dietary sources.
After the person swallows 100 antacid tablets the person’s blood calcium level would rise
significantly in 10 minutes. One negative feedback loop that would be involved is: high level of
calcium ion in blood will stimulates parafollicular cells (receptors) in the thyroid gland (control
center) to secrete calcitonin (the output). Calcitonin inhibits activity of osteoclasts (effector), speeds
blood calcium ion uptake by bone (effector) and accelerates calcium ions deposition into bones. This
results in calcium promoting bone formation and decrease blood calcium ion level.
Another negative feedback loop is involved: high level of calcium ion in blood will be detected by
parathyroid gland cells (receptor) and consequently lower parathyroid hormone (the output)
produced by parathyroid gland. Osteoclasts (effector) activities decreases and kidney will release
calcium in urine. Calcitonin which is released by the thyroid gland decreases blood calcium levels
when they are too high. These actions occur as a response to calcitonin and will return the blood
Assignment 1 :: Biology 235: Human Anatomy and Physiology 2
The benefits of buying summaries with Stuvia:
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
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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 colombe_kanku. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$10.78. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
71498 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now