Class Notes (923,234)
CA (543,168)
UTSC (33,026)
BIOD27H3 (56)
Lecture 18

BGYB30H3 Lecture 18 Notes Endocrinology 1-Nov 10

2 Pages
144 Views

Department
Biological Sciences
Course Code
BIOD27H3
Professor
Ingrid L.Stefanovic

This preview shows half of the first page. Sign up to view the full 2 pages of the document.
BGYB30H3 Lecture 18 Notes
-smooth muscle is found in the walls of hollow organs and tubes in blood vessels
-contraction changes shape of organs and moves materials in, out, or around the body
-smooth muscle has low fatigue, low oxygen consumption, less energy required to generate
force
-smooth muscles are small and have a single nucleus in spindle fibres
-neurotransmitters and sex hormones control smooth muscles
-smooth muscles integrate signals and act based on the majority of neurotransmitters
-smooth muscles may hyperpolarize or depolarize depending on the signal
-smooth muscles may depolarize without a graded or action potential or a change in
membrane potential
-in a single unit cell smooth muscle, cells contract as a unit through being connected by gap
junctions, which conducts electrical synapses
-multi-unit smooth muscle involves cells associated with variscosities with no gap junctions,
allowing fine control of contractions
-smooth muscle in the uterus goes from multi-unit to single unit during pregnancy
-smooth muscle has longer actin and myosin filament
-rate of cross bridge cycling is slower in smooth muscle to allow longer contractions
-there is less sarcoplasmic reticulum than skeletal muscles
-caveolae concentrates calcium in the smooth muscle
-smooth muscles lack troponin and sarcomeres
-smooth muscles have oblique bundles that extend diagonally
-ÁZvZu}}Zuµo}vU](}uPo}µoZv}v[PZ}
-myosin moves slowly and lengthens the contraction period by decreasing the rate of
crossbridge cycling
-myosin light chain kinase regulates contractions
-lack of sarcomere allows myosin to move longer distances with actin sliding over it
- a reflex is the integration of sensory info to control muscles/glands
-input is integrated in the spinal cord or the brain to cause an output
-feedforward allows the body to anticipate stimuli and begin a response prior to the stimulus
-reflexes can be classified by the
x by being viscera or somatic
x number of neurons in the pathway
x learned through conditioning or innate
x originates in the spinal cord or the brain
-autonomic reflexes are sometimes caused by the spinal cord or modulated by descending
tracts from the brain
-spinal reflexes include
x urination
x defecation
-brain stem reflexes include
x Sneezing
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
BGYB30H3 Lecture 18 Notes -smooth muscle is found in the walls of hollow organs and tubes in blood vessels -contraction changes shape of organs and moves materials in, out, or around the body -smooth muscle has low fatigue, low oxygen consumption, less energy required to generate force -smooth muscles are small and have a single nucleus in spindle fibres -neurotransmitters and sex hormones control smooth muscles -smooth muscles integrate signals and act based on the majority of neurotransmitters -smooth muscles may hyperpolarize or depolarize depending on the signal -smooth muscles may depolarize without a graded or action potential or a change in membrane potential -in a single unit cell smooth muscle, cells contract as a unit through being connected by gap junctions, which conducts electrical synapses -multi-unit smooth muscle involves cells associated with variscosities with no gap junctions, allowing fine control of contractions -smooth muscle in the uterus goes from multi-unit to single unit during pregnancy -smooth muscle has longer actin and myosin filament -rate of cross bridge cycling is slower in smooth muscle to allow longer contractions -there is less sarcoplasmic reticulum than skele
More Less
Unlock Document


Only half of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit