A difference between marathon runners and sprinters is ______. sprinters perform better in activities that require slow, steady muscle activity sprinters have a high proportion of muscle fibers that require oxygen to make ATP marathon runners have more fast-twitch muscle fibers in their leg muscles marathon runners have more slow-twitch fibers in their leg muscles

A difference between marathon runners and sprinters is ______. sprinters perform better in activities that require slow, steady muscle activity sprinters have a high proportion of muscle fibers that require oxygen to make ATP marathon runners have more fast-twitch muscle fibers in their leg muscles marathon runners have more slow-twitch fibers in their leg muscles

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter32: Structural Support And Movement

Section: Chapter Questions

Problem 2CT: After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses...

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Elite sprinters have a high concentration of muscle fibers with the fastest cross-bridge cycling and a high concentration of glycogen. What type of muscle fibers are these? type I red fibers type IIx Type IIIa two of the above
Muscles with pacemakers are unique in that they have __. motor neurons in the brain and spinal cords that synapse with them as a regular frequency separate neuromuscular junctions on each of the muscle cells to set the pace of contraction cells that generate action potentials at a regular rate without stimulation from a motor neuron
The depletion of ATP in muscle cells causes ____. myosin heads to remain bound to actin calcium ions to be released from the sarcoplasmic reticulum myosin-binding sites on actin to be blocked again by tropomyosin. ligand-gated sodium channels to close again
Compared to fast twitch muscle fibers, slow-twitch fibers _____. A are able to produce much greater force during contractions B "have more myoglobin, more mitochondria, and greater endurance" C "are lighter in color, wider in diameter, and receive less blood flow" D cannot maintain contractions as long because they have fewer mitochondria
PLEASEEEEE CREATE A DIAGRAM A DIAGRAM DRAW A DIAGRAM TO OUTLINE THE MUSCLE CONTRACTIONS STARTING FROM NEURONS IMPULSE OF A PROFESSIONAL WEIGHTLIFTERS DURING A WEIGHTLIFT
Poor blood circulation will likely reduce the contraction power of a person's myosin actin fast twitch fibers slow twitch fibers
Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.
Bones are __________. a. mineral reservoirs b. skeletal muscle's partners c. sites where blood cells form d. all of the above
In an isometric contraction, the muscle ________." shortens without a load does not change in length but increases tension is not stimulated by a motor neuron is unable form cross-bridges and fails to develop tension Which method of regenerating ATP is used in a very short duration activity, such as a 100m sprint, because it is the most rapid method of regenerating ATP?" aerobic respiration in the mitochondria glycolysis in the mitochondria anaerobic respiration in the cytoplasm (or cytosol) breaking a phosphate bond on phosphocreatine The metabolic pathway that results in the production of two net ATPs per glucose plus two pyruvic acid molecules ________. only occurs within the mitochodria is called glycolysis only occurs when there is no oxygen present is the main method of generating ATP for maximum effort activities that last 1-2 Where does overÊ95% of a skeletal muscle cell's energyÊcome from during both rest andÊmoderate exercise? creatine phosphate lactic acid anaerobic…
describe the rise in calcium in the sarcoplasm can lead to skeletal muscle contraction Don't copy from Google
The rising phase of a muscle twitch represents ________. the time of relaxation of the muscle fibers the time between stimulus and active muscle contraction the time of shortening of the sarcomeres of the muscle fibers

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		sprinters perform better in activities that require slow, steady muscle activity
		sprinters have a high proportion of muscle fibers that require oxygen to make ATP
		marathon runners have more fast-twitch muscle fibers in their leg muscles
		marathon runners have more slow-twitch fibers in their leg muscles