Exam (elaborations)
BIOS 252 Anatomy and Physiology Exam 1 Study Guide Chamberlain College.
- Course
- Institution
BIOS 252 Anatomy and Physiology Exam 1 Study Guide Chamberlain College.
[Show more]
Content preview
BIOS 252 Anatomy and PhysiologyExam 1 Study Guide Chamberlain
College.
ependymal cells
✔✔- line internal cavities of the brain
- secrete & circulate CSF
microglia
✔✔- macrophages
- develop from WBC (monocytes) & become
concentrated in areas of damage
astrocytes
✔✔- most abundant in CNS
- create supportive framework
- form blood-brain barrier
graded potential
✔✔1. stim does not reach threshold level
2. stim causes local change in membrane potential (ie:
-70 to -60mv)
3. it dies down over short distance
4. can be summated
5. does not obey all or non law
action potential
✔✔1. stim reaches threshold level therefore causes
AP
2. stim causes depolarization to threshold level
3. it is propagated
4. cannot be summated
5. obeys all or none law
,voltage-gated channels
✔✔controlled by membrane potential
ligand-gated channels
✔✔controlled by binding of a ligand to a membrane
protein (either on outside or inside)
mechanical-gated channels
✔✔controlled by mechanical force on cell
do skeletal muscles always pull
✔✔yes
H pattern
✔✔physical exam to test extrinsic eye muscles
1st step of contraction cycle
✔✔myosin head hydrolyzes ATP & become
energized & oriented
2nd step of contraction cycle
✔✔myosin head binds to actin, forming a cross-
bridge
3rd step of contraction cycle
✔✔myosin head pivots, pulling the thin filament past
the thick filament toward center of sarcomere (power
stroke)
4th step of contraction cycle
✔✔as myosin head binds ATP, cross-bridge detaches
, from actin
how are skeletal muscles names
✔✔direction of fascicles, size, shape, action, # of
origins, location of muscle, sites of origins & insertion
of the muscles
skeletal muscle
✔✔- long, thin, cylindrical in shape
- multinucleated
- attached to bone & skin
- voluntary
- striated
cardiac muscle
✔✔- short, fat, branched
- uninucleated
- in heart
- attached to intercalated discs
- involuntary
- striated
smooth muscle
✔✔- in hollow organs
- ininucleated
- involuntary
- lack striations
excitability
✔✔responsiveness to chemical signals, stretch, and
electrical changes across the plasma membrane
conductivity
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 saraciousstuvia. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73773 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now