Chapter 17 (Metabolism and Exercise 2) Flashcards
What are the types of muscles?
Cardiac muscle
Smooth muscle
Skeletal (voluntary) muscle
Cardiac muscle features
Myogenic
striated
has intercalated discs
What is the purpose of intercalated discs?
cells membranes fuse and form gap junctions
free diffusion of ions for action potential movement
Where are cardiac muscles found?
Only found in heart
- some in walls of atria
- some in walls of ventricles
- some in specialised and conductive tissue
Give three features of smooth muscle
Tires easily
Not under conscious control
has circular and longitudinal bundles for peristalsis.
How is smooth muscle used in the iris?
circular bundles: contraction –> constriction of pupil
radial bundles: contraction –> dilation of pupil
Give three features of skeletal muscle.
multinucleated
striated
under conscious control of motor cortex
Where is skeletal muscle found?
Attached to bones via tendon
Contraction results in movement of the skeleton.
PICTURES OF MUSCLES
photos
What is a myofibril?
Many sarcomeres joined together (protein)
What is a fascicle?
A tissue…
What is a sarcomere?
Contractile unit of proteins
What are actin, myosin, troponin, tropomyosin
Proteins
What is a myocyte?
A muscle cell
Muscle –> sarcomere
…..
