Ch. 11 d Cardiac muscle (lecture)
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What are some important properties of cardiac muscle?
- Cells of each chamber must contract in unison
- Must work even under unconscious control
- Must be highly resistant to fatigue
- Uses nearly exclusively aerobic respiration, has large mitochondria
What are the linkages between cardiac myocytes?
What are some features of smooth muscle cells?
- Thick and thin filaments are not aligned, so no striations.
- Only one nucleus
Axons do not connect to smooth muscle and make an NMJ. How do smooth muscle cells get their stimulation?
From branches of a nerve fiber called a vericocyte, which forms a synapse. The cells contract in unison because they are electrically connected by their gap junctions.
What are the two layers of smooth muscle cells?
- Circular layer (inner)
- Longitudinal layer (outer)
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