Answer the following questions.1. list and describe the anatomical components that make up a muscle fiber. 2. list the components of a motor unit. 3. what are the steps in excitation–contraction coupling? 4. what is the role of calcium in muscle contraction? 5. describe the sliding filament theory. how do muscle fibers shorten? 6. what are the basic characteristics that differ between type i and type ii muscle fibers? 7. what is the role of genetics in determining the proportions of muscle fiber types and the potential for success in selected activities? 8. describe the relation between muscle force development and the recruitment of type i and type ii motor units. 9. explain, and give examples of, how concentric, static, and eccentric contractions differ. 10. what two mechanisms are used by the body to increase force production in a single muscle? 11. what is the optimal length of a muscle for maximal force development? 12. what is the relation between maximal force development and the speed of shortening (concentric) and lengthening (eccentric) contractions? 13. in muscle contraction, what roles are played by the protein titin? 14. why do previously trained muscles adapt more quickly to retraining after a period of disuse?

Answers are explained below...

Explanation:

1. A muscle fiber is composed up of myofibrils that contain an arrangement of sarcomeres (A sarcomere is the basic contractile unit of a myofibril...)

Moreover a sarcomere also contains actin and myosin filaments for relaxation and contraction of a muscle as a whole.

2. The motor unit of a muscle is composed up of a neuron called as motor neuron (you can guess by it's name that it serves some motor function). The axonal endings of a motor neuron are embeded in a muscular fiber. A series of nerve impulses control the action of muscle.

Sorry because of time limit...

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.