Muscle Identification
Cardiac muscle
Identify the muscle tissue
Skeletal muscle
Identify the muscle tissue
A: Branching B: Intercalating discs C: Nucleus D: Muscle fibers
Identify each structure
A: Fascicle B: Muscle Fiber C: Endomysium D: Perimysium
Identify each structure
A: H-zone B: M-line
Identify each structure
A: Nucleus B: Endomysium C: Muscle fibers
Identify each structure
A: Relaxed muscle B: Myosin C: Dense Body D: Actin E: Contracted muscle
Identify each structure
A: Sarcomere B: Z-disk C: A-band D: I-band
Identify each structure
A: motor nerves B: Muscle cells A+B: motor unit
Identify each structure
A: Nucleus B: Mitochondria C: Myofibril D: Intercalated disk
Identify each structures
A: Relaxed B: Dense bodies C: Contracted
Identify each structures
Soft muscle
Identify the muscle tissue
A: Synaptic vesicles B: Sarcolemma C: Synaptic cleft What is the entire structure called? The neuromuscular junction
Identify the structures
Smooth muscle tissue
Identify the type of muscle tissue
Why do skeletal and cardia muscles have a striated appearance, but smooth muscle does not?
Skeletal and cardiac muscles are composed of sarcomeres and arranged in bundles. Sarcomeres are regularly arranged structures composed of actin and myosin. The dark bands are made of myosin and the light bands are made of actin. In contrast, smooth muscle does not contain the regular arrangement of sarcomeres and the cells are arranged in sheets. This arrangement produces the smooth, uniform appearance.
Resembles skeletal: - contractile elements arranged in sarcomeres - Troponin involved in contractile mechanism Resembles smooth muscle: - Contraction possible in absence of nervous innervation - Each cell has a single nucleus - Cells communicate through gap junctions
Sort the following cardiac properties into cardiac or smooth based on resemblance: - cells communicate through gap junctions - contraction possible in absence of nervous innervation - contractile elements arranged in sarcomeres - each cell has a single nucleus - Troponin involved in contractile mechanism
Cardiac: - branching cells - intercalated discs Skeletal - peripheral nuclei - Multinucleated cells Smooth - centrally located, oval nuclei - slow, wavelike contractions - fusiform cells
Sort the following into cardiac, skeletal, or smooth: - branching cells - centrally located, oval nuclei - fusiform cells - intercalated discs - multinucleated cells - peripheral nuclei - slow, wavelike contractions
When the nerve impulse to the muscle stops
When does muscle contraction stop?
