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Introduction to Anatomy & Physiology
By Ninja Nerd

Homeostasis
When we talk about homeostasis is trying to be able to maintain a degree of balance, so
whenever something is out of balance
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Some some
things like glucose
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How do we help to counteract the imbalance
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So I want you to think about the mechanism as the counter
response
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The pancreas will make a very special type
of hormone called insulin
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insulin
is then going to go and act on an effector
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It's going to produce a particular response
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act on the glut receptor, which is going to be the receptor
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Glucagon
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what will
happen my friends
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I do n't want to cool my body
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I ''m going to send signals to my muscles
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homeostasis is maintaining a state of balance many
different disease processes do n't allow for that counterbalance
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positive feedback mechanism amplifies the response to the initial stimulus would
actually be
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These stretch receptors then
send afferent signals to your control center and in this case that control center
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The stimulus was the suckling the receptor was the mechanoreceptor
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the effector will be the breast tissue
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What does it do to the actual breast tissue to produce a response
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amplified the response that 's another
concept of a patient developing a positive feedback mechanism
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The trigger was the baby
suckling
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Body Cavities & Serosal Membranes
This is supposed to be kind of an introductory topic in the sense that when we talk about
body cavities we can obviously dive into these way more in detail and go through all the
different complexities and different vessels and nerves and organs that's involved in a
particular body cavity
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The ventral body cavity is made up of the thoracic
cavity and the abdominal pelvic cavity
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The superior mediastina is the inferior medius item sectioned in
the anterior middle and posterior
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Inside of the pleural
cavity contains a little bit of fluid called pleural fluid or a serosal fluid
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The middle mediastinum contains the heart and again the cavity that this heart is sitting in is
the pericardial cavity
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This is the perry cardio cavity or space and the same concept as
every other cavity
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Within the thoracic cavity we have
another cavity called the pericardial cavity which houses the heart
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The layer of
tissue that clings to the organ in the abdominal pelvic cavity is called the visceral
peritoneum
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Zach says that sometimes you may think these things just look like they're "too far apart
Zach in comparison to the lungs
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The quadrant system is made up of four different zones: the umbilicus, the midline of the
patient, the crest area near the iliac crest, and the midlines near the clavicles
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For example, on the left side
of the patient, we would call this zone the right hypochondriac region and it would contain
mainly organs like the liver and the biliary tree
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The one
ventral body cavity contains both thoracic and abdominal pelvic cavities
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Anatomical Orientation & Regional + Directional
Terminology
In this video, we are going to be discussing anatomical position regional terminology and
directional terminology
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channel if you want to check out our website
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Skelly has the thoracic region both the anterior
and posterior portions
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The pelvic

region is the pelvic region and a part of that is the lumbar region which is the lower back
part
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Is going to be right here you'll have this region here which is the inguinal region and
then here is the pubic region
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We've covered again the arm, the
forearm, and the acromial region of the shoulder
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There are different terms for anterior
(anterior ventral), posterior (posterior ventral), and lateral (lateral) depending on where you
are looking from
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There are many different ways for that concept so that covers
lateral and medial as well as proximal and distal
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Body Planes & Sections
we are going to be talking about body planes and sections
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The concept is important as you go through
anatomy to be able to realize, “Oh, that’s a frontal or coronal section that’s a sagittal section
that’s a transverse or axial section
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I hope
this made sense and I hope that you guys enjoyed it

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