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

In which type of muscle fibers is ATP synthesized aerobically in mitochondria?                                 smooth                                 cardiac                                 skeletal                                 all of the above 2. In which types of muscle fibers are action potentials transmitted from one cell to the next through gap junctions?                                 unitary smooth and cardiac                                 cardiac and skeletal                                 skeletal and smooth   3. All types of muscle have actin and myosin, but not all types have sarcomeres."  True    False

Why does continuouns calcium release within a muscle fiber cause greater tension? Acticates more calcium pump  Activates myofibrils continuously  Increase action potential frequency  Lengthens sarcomere

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

What contains troponin, is involuntary and intracellular calcium is necessary in muscle contraction? Multi-unit smooth muscle Unitary smooth muscle O Cardiac muscle fiber Red skeletal muscle fiber White skeletal muscle fiber

Skeletal muscle cells have the ability to do all of the following EXCEPT _____.     activating other muscle cells to contract     producing force while shortening     responding to chemicals released by nerve cells     rebounding to their former length after being stretched

What step DIRECTLY causes a sarcomere to shorten? cross- bridge formation  calcium transport into SR calcium release  power stroke myosin heads in high energy state

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

You are helping Eldon Tyrell create replicants to work in off-world colonies. You want to design muscle cells that can produce the most tension. These muscle cells will have an abundant amount of: Moments that will be lost in time, like tears in rain... Sarcolemma Mitochondria O Myofibril

Determine whether the following description is common to skeletal muscle, cardiac muscle or both skeletal and cardiac muscle. increase in tension during contraction of the muscle organ involves recruitment of other cells is primarily under the control of the autonomic nervous system all cells depolarize and contract during every contraction of the muscle organ different neurotransmitters can increase or decrease the rate of contraction action potentials begin electrical depolarization by a voltage-gated Na+ channel 1. skeletal muscle 2. cardiac muscle increase in cytosolic 3. skeletal muscle and cardiac muscle calcium increases tension in muscle cells prolonged depolarization is due to Ca2+ influx across the plasma membrane contraction is not under the control of hormones relaxation occurs when cytosolic calcium is reduced to resting levels increase in tension during contraction of single cells is associated with a higher frequency of action potentials