shs gen bio 2- lecture presentation on homeostasis and feedback mechanism

5. ATTENDANCE CHECKING
As I call your name, kindly
choose among the adjectives
that will describe what you
feel today.

6. ATTENDANCE CHECKING
CHILL COOL HOT

7. KINDLY USE THE PROMPT BELOW:
“Good morning everyone, my
name is ____________and I am
_________________.”

12. REVIEW QUIZ
Directions: Read each question and choose the correct answer.
1. The frog was not easy to hold during our dissection activity
because the skin is slimy and wet. Which of the ff. support
the reason for the characteristics of a frog’s skin?
A. Frog skin also serves as a respiratory organ; the skin should be moist to
breathe in water.
B. Frogs can absorb water through their skin, so they don’t need to drink
water.
C. Frog skin is thin, slippery, and moist for protection against their predators
D. Frogs have a special ability to breathe underwater through their skin

14. REVIEW QUIZ
Directions: Read each question and choose the correct answer.
2. During the field study, Mico observed
the two sets of flowers in the corn plant.
The male flower is located on the axis,
while the female flower is on the lower
periphery. Corns with separate male and
female flowers in one are
_____________plants.
A. Bisexual C. Dioecious
B. Imperfect D. Monoecious

16. REVIEW QUIZ
Directions: Read each question and choose the correct answer.
3. Kuya Kim is very devoted to triathlon
and joined a national event. After long
hours of tremendous activity, what
changes will occur?
Depth of
Breathing
Rate of
Breathing
% of O2 in
inhaled
air
A. Increases Increases Increases
B. Decreases Constant Increases
C. Increases Increases Constant
D. Decreases Constant Constant

18. Feedback Mechanism and
Homeostasis
Most Essential Learning Competency:
Explain how some organisms
maintain steady internal
conditions that possess
various process
(STEM_BIO11/12-Ivi-

20. Background and Information:
Normal breathing rates from 12-25 times per minute. In this
activity, you will compare your breathing rate at rest to your
breathing rate after exercise.
Procedure:
1. The learners will be grouped into two.
2. Each group should get the initial breathing rate, heart rate, and blood
pressure.
3. The learners will do the “GALAW PILIPINAS” dance exercise.
4. After the dance exercise, the learners will get the final body
parameters and should compare them with the previous record.
5. Each group will tabulate or graph their records, and answer the guide
guide questions:
6. A member from each group will present their output.

22. Guide Questions:
1.How did exercise affect your body
parameters?
2. What other factors besides exercise
might influence your normal body
parameters?

24. interactions = adaptation= survival
Problems
health
environment
livelihood
Stimulus/
Stimuli
How?

25. HOMEOSTASIS
“SIMILAR “STEADY

26. HOMEOSTASIS

27. HOMEOSTASIS
- is a self-regulating
process by which
biological systems tend
to maintain stability
while adjusting to
conditions that are
optimal for survival

28. * Our body can keep internal
conditions to be stable despite the
changes in the environment.

30. Response to
changes –
*organs
Receives data of
stimulus,
interprets and
process the
message
How does the body control the changes?
Collect the
information
relative to the
environment and
detect the
stimulus
RECEPTORS/
SENSORS
CONTROL
CENTER
Delivers messages
to target organs
via nerve impulses
and hormones
COMMUNICATION
SYSTEM
TARGETS/
EFFECTORS

33. Feedback Mechanism
is the physiological
regulatory system in a
living body that works
to return the body to
the normal internal
state or homeostasis.

34. * In living systems, feedback
mechanisms or feedback loops bring
the body towards homeostasis by
either amplifying a specific biological
pathway or function or inhibiting it.

35. Types of Feedback Mechanisms
• Positive Feedback
• Negative Feedback

41. Arrange Me!
Direction: Give the correct sequence of events of the
chosen body change/process:
A.Blood Sugar Level
B.Thermoregulation

43. Thermoregulation
The skin detects
cold causing the
blood vessel to
contract
The heart beats
slower sending
signal to the
brain
The
hypothalamus
sends signal to
the skin
The muscle
contract to
generate heat Shivering

44. The skin detects
heat causing the
blood to dilate
The heart beats
faster sending
signals to the
brain
The
hypothalamus
sends signal to
the sweat
glands
The sweat gland
produces sweat
in order to cool
down
Sweating

46. Glucose Level
The blood sugar
level drops due
to skipping
breakfast
The pancreas
releases
glucagon into
the liver
Glucagon
breaks down
glycogen in the
liver
The blood sugar
increases Low Glucose Level

47. Glucose Level
Having too
much milk tea
in a day
The pancreas
releases insulin
into the liver
Insulin breaks
down glycogen
in the liver
The blood sugar
decreases
High Glucose Level