Republic of the Philippines
Department of Education
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY
Q3 Week 4
FEEDBACK MECHANISM TO ATTAIN
HOMEOSTASIS
Republic of the Philippines SCIENCE 10
Department of Education Quarter 3- Week 3.2 /4
STO. ANGEL NHS
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY SCORE/S : _______ ; ______
______________________
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LEARNER’S ACITIVTY SHEET(LAS)
SCIENCE 10
Quarter 3 – Week 3.2 / 4
Name of Learner
Grade level and
Section
Date
FEEDBACK MECHANISMS TO MAINTAIN HOMEOSTASIS
Most Essential Learning Competency: Describe how the nervous system coordinates and
regulates these feedback mechanisms to maintain homeostasis.
Learning Context
Homeostasis, in a general sense, refers to stability, balance, or equilibrium.
Physiologically, it is the body’s attempt to maintain a constant and balanced internal
environment, which requires persistent monitoring and adjustments as conditions change. It is
typically achieved via negative feedback loops, but can be affected by positive feedback loops,
set point alterations, and acclimatization. Homeostasis is maintained by negative feedback
loops within the organism. In contrast, positive feedback loops push the organism further out
of homeostasis but may be necessary for life to occur. Homeostasis is controlled by the nervous
and endocrine systems in mammals. https://courses.lumenlearning.com/
Fig. 1 Thermoregulation of the Nervous System
Republic of the Philippines
Department of Education
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY
https://whs.rocklinusd.org/
Learning Task: Feedback Mechanisms
Direction: Read the following article, analyze the diagram then answer the given activity.
How the Nervous System Coordinates and Regulates Feedback Mechanism to
Maintain Homeostasis
The body has a variety of control systems to keep its internal environment stable and
responsible for maintaining homeostasis.
1. Negative feedback is a control system to reduce or minimize any changes or conditions of
the body, which helps the whole-body system to be stable. It is also a mechanism that
regulates homeostasis. The term negative is a deviation from set point. The set point refers
to the normal value and ideal requirement of the body to maintain homeostasis.
Components of Negative Feedback
• The control center of the body is the brain, which establishes the set point.
• The receptor detects changes within the body. The receptor monitors the environment and
responds to change (stimuli).
• The effector is responsible for the response to changes.
• The stimulus produces a change to a variable (the factor being regulated).
Fig. 2 Negative Feedback Loop for Homeostasis of Temperature
https://www.scientistcindy.com/
Republic of the Philippines
Department of Education
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY
2. Positive feedback is a control system that uses information from sensors to increase the
rate of processes. It is also the exact opposite of a negative feedback mechanism. This type
of feedback is important whenever a rapid change is necessary. It deviates from a set point,
therefore it becomes greater, which makes a bad situation worse. This type of feedback is
rarely found in healthy people. For instance, if you cut your finger, positive feedback
mechanism is used in the production of nerve impulses and increases the rate of change in
blood clotting until the wound is sealed.
uterus
cervix
Fig. 3 Positive Feedback Loop for Uterine Contraction during Childbirth
Image credit: Homeostasis: Figure 2 by OpenStax College, Anatomy & Physiology, CC BY 4.0
In Figure 3, a positive feedback loop comes into play during childbirth. In childbirth, the baby's head presses
on the cervix—the bottom of the uterus, through which the baby must emerge—and activates neurons to the brain.
The neurons send a signal that leads to release of the hormone oxytocin from the pituitary gland. Oxytocin
increases uterine contractions, and thus pressure on the cervix. This causes the release of even more oxytocin
and produces even stronger contractions. This positive feedback loop continues until the baby is born.
Republic of the Philippines
Department of Education
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY
LEARNING TASK 1 (20 pts.)
Procedure:
1. Carefully analyze the diagram of a negative feedback mechanism.
2. Answer the guide questions correctly.
Identify the components of a negative feedback mechanism.
2. 3. 4.
1. 5.
Guide Questions:
FEEDBACK
1. What is homeostasis? ____________________________________________________
________________________________________________________________________
2. When does positive feedback mechanism occur in the body?
__________________________________________________________________________
_____________________________________________________________________
3. How does the nervous system coordinate and control the feedback mechanisms to
maintain homeostasis?
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
LEARNING TASK 2 (10 pts.)
Reflection:
I learned that ______________________________________________________________
_________________________________________________________________________
I realized that ______________________________________________________________
_________________________________________________________________________.
Prepared by: ROMUALDO H. VASQUEZ
Name of Writer
Republic of the Philippines
Department of Education
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY
For Quality Assurance MA. BELLA A. SANTOS
Reviewed by: Public School District Supervisor
Reviewed by:
RICHELL Q. OMANA
Head Teacher III-Science
School Head
ROSZIEL S. ROSALES HENRY P. CONTEMPLACION
Education Program Supervisor I, Science Education Program Supervisor (LRMS)
Approved by:
VINCENT EMMANUEL L. ILAGAN
CID - Chief Education Program Supervisor
Republic of the Philippines
Department of Education
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY
FINAL INSTRUCTION
1. Write your answer on a pad paper.
2. Submission date depends on the quarantine restrictions.
3. Video lesson will be provided within the week about this topic.
4. If you have enough mobile data, you may submit a photo of your answer
sheet / paper. This is optional.
Republic of the Philippines
Department of Education
REGION IV-A CALABARZON
SCHOOLS DIVISION OF SAN PABLO CITY