Which of the following muscle types and characteristic is correctly matched? Group of answer choices Cardiac muscle : dense body anchoring proteins Skeletal muscle : varicosity at neuromuscular junctions Smooth muscle : Calcium-calmodulin regulation of myosin light chain kinase Cardiac muscle : calcium only from the sarcoplasmic reticulum

The epimysium, perimysium, and endomysium are made up of . tissue. nerve connective epithelial muscle Titin molecules are found in the, of a muscle fiber. myosin actin elastic filaments nuclei

As an action potential moves along the sarcolemma, the brief opening of voltage-gated Na+ channels will allow Na+ to rush into the muscle cell, causing the inside of the membrane at that location to become more ________.      positive     negative

Compared to skeletal muscle, smooth muscle None of the choices are correct Has equal thick and thin filaments Uses calcium from the extracellular fluid only Has the same contractile and regulatory proteins. Has much more thick filaments than thin filaments

Complete the following statements about the structure of the different muscle types. Not all choices will be used.

A muscle cannot respond to appropriate nerve stimuli. Which muscle characteristic is impaired? Contractility Extensibility Elasticity Irritability

In which type(s) of muscle cells does each cell have its own neuromuscular junction?                                 skeletal only                                 unitary smooth and skeletal                                 skeletal and cardiac       2. The follow is NOT true of CARDIAC muscle fibers:        - connected by gap junctions       -  include pacemaker cells that can produce produce action potentials at regular intervals without innervation        - without calcium cross bridge cycles will not occur and fibers will not shorten        - each cell in a motor unit has a neuromuscular junction with the same motor neuron                                 actin and myosin filaments are arranged in sarcomeres                                 produce greater force when stretched than at resting length   3. Match the following:   -Skeletal muscle   -Cardiac muscle   -Smooth muscle Can maintain prolonged isometric contractions with very little energy Striated muscle fibers with gap…

What allows cardiac muscle and smooth muscle to be excited and contract nearly simultaneously? ganglia intermediate fibers cross bridges motor and plates Gap junctions

place in correct order 1. ACH binds to receptors on the postsynaptic membrane 2. AP travels along the sarcolemma and T tubules 3. Ca++ ion bind to troponin 4.  Ca++ ions diffuse into the sarcoplasm 5. voltage-gated Ca++ ion channels in the sarcoplasmic reticulum open

Which of the following features is common to Type 1 muscle fibers but not Type 2 muscle fibers? fast and powerful contraction has large blood supply and many mitochondria relies mostly on anaerobic respiration to generate ATP has low amounts of myoglobin