Physiology drawing about the cell, and explains the different parts of the cell. It also explain the function of the following cell parts. Includes in the refferences that was used at the end of the document.
POGONATUM : morphology, anatomy, reproduction etc.
Jacobe Physio1.docx
1. EXERCISE No. 1
HOMEOSTASIS
Overview:
Homeostasis is the maintenance of nearly constant conditions in the internal
environment. It is a tegulated process by which a biological system maintains
dynamic but relatively consistent internal conditions during pressures incurred
from both internal and external factors.
Part I.
1. Explain what happens to your body when you get
too hot.
- As I have remembered throughout the lesson,
that our body reacts by releasing sweat
through the skin. This serves as cooling
effect to our body.
2. Explain what happens to your body when you get too cold.
- When the body temperature drops it will cause
the body to have a hypothermia, is a medical
emergency that occurs when your body loses
heat faster than it can produce heat, causing
a dangerously low body temperature. Normal
body temperature is around 37 degree
Celsius.
3. Describe vasoconstriction.
- Vasoconstriction.is the narrowing of the
blood vessels, thus when it occurs the blood
flow in some of your tissues may restrict in
flowing or tighten.
Name: Ervin Jasper A. Jacobe Date: Sept. 2020
Score:
Year Level: Bspt 1
2. 4. Describe vasodilation.
- It is the opposite of Vasoconstriction wherein
Vasodilation widens the blood vessels to have
an increase in blood flow and decrease in
your blood pressure
Part II. Homeostatic Control Mechanism Components. Define.
1. Variable - Homeostatic control mechanisms have at
least three interdependent components: a
receptor, integrating center, and effector
2. Receptor - receptor senses environmental stimuli,
sending the information to the integrating
center.
3. Control Center - The integrating center, generally a
region of the brain called the hypothalamus,
signals an effector (e.g. muscles or an organ )
to respond to the stimuli.
4. Effector - Positive feedback enhances or
accelerates output created by an activated
3. stimulus. Platelet aggregation and accumulation
in response to injury is an example of positive
feedback.
Negative feedback brings a system back to its
level of normal functioning. Adjustments of blood
pressure, metabolism, and body temperature are
all negative feedback.
Part III. Explain and give an example of each of the following:
1. Negative Feedback
Negative Feedback
Negative feedback mechanisms reduce output or
activity to return an organ or system to its normal
range of functioning. Regulation of blood pressure is
an example of negative feedback. Blood vessels have
sensors called baroreceptors that detect if blood
pressure is too high or too low and send a signal to
the hypothalamus. The hypothalamus then sends a
message to the heart, blood vessels, and kidneys,
which act as effectors in blood pressure regulation.
If blood pressure is too high, the heart rate
decreases as the blood vessels increase in diameter
(vasodilation), while the kidneys retain less water.
These changes would cause the blood pressure to
return to its normal range. The process reverses when
blood pressure decreases, causing blood vessels to
constrict and the kidney to increase water retention.
4. 2. Positive Feedback
Positive Feedback
Positive feedback is a mechanism in which an output
is enhanced in order to maintain homeostasis.
Positive feedback mechanisms are designed to
accelerate or enhance the output created by a
stimulus that has already been activated. Positive
feedback mechanisms are designed to push levels out
of normal ranges. To achieve this, a series of events
initiates a cascading process that builds to increase
the effect of the stimulus. This process can be
beneficial but is rarely used because it may become
uncontrollable. A positive feedback example is blood
platelet accumulation and aggregation, which in turn
causes blood clotting in response to an injury of the
blood vessels.
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