During muscle contraction, some energy is supplied from creatine phosphate. Which of the following events occurs during the breakdown of creatine phosphate?   Question 6 options: a ATP molecules breakdown producing ADP + P groups. b ATP molecules are formed when P groups are bonded to ADP. c ADP molecules break down producing AMP + P groups. d ADP molecules are formed when P groups are bonded to AMP

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…

Define what the NMJ is and why it's important for muscle contraction. Explain in short the process of the NMJ signaling the muscle to contract.  Note the difference between a motor unit and the NMJ.

Based on what you know about the neuromuscular junction and muscle contraction, describe very specifically how Botox injections cause localized muscle weakness/paralysis.

The sliding filament model depicts how myosin motors attached to actin lead to muscle contraction. This process proceeds in a precise series of events. Indicate which of the following shows the correct order of steps in the sliding filament model. Group of answer choices Myosin binds ATP; myosin tightly binds actin; power stroke; myosin releases actin Myosin binds GTP; myosin releases actin; power stroke; myosin tightly binds actin Actin binds ATP; power stroke; myosin tightly binds actin; actin releases ADP Actin binds ADP; myosin releases actin; power stroke; actin releases ADP

An ion that is essential for muscle contraction is Ca2+.  Which of the following statements about the calcium ion and muscle contractions is TRUE? Select one: a. Muscle contractions can occur whether Ca2+ concentrations are high or low.  b. Ca2+ binds to the tropin-tropomyosin protein complex shifting it out of the way and allows the myosin to bind to the actin so contraction can occur. c. When Ca2+ concentrations are high, tropomyosin inhibits myosin binding and the muscle is relaxed. d. Ca2+ ions are stored in the sacroplasmic reticulum during the muscle contractions. I do not know which one is

Image A Image B Z M F. The images above represent the contracting unit of a muscle fiber. Using the images shown, answer the following questions. Be sure that you label your answers a, b and c. a. What is a contracting unit of a myofibril called? b. Which image represents a myofibril that is fully contracted? c. Explain how you derived your answer to part b. Be sure to use the words for the myofilaments that are involved in muscle contraction in your answer.

A fatigued muscle lacks sufficient oxygen for the aerobic respiration to supply needed ATP. The accumulation of Select one: a. acetic acid occurs and contractions occur with less strength b. lactic acid (lactate) occurs and muscle cramps may set in c. pyruvate occurs and muscle cramps set in d. ethyl alcohol occurs and less frequent contractions occur

An ion that is essential for muscle contraction is Ca2+.  Which of the following statements about the calcium ion and muscle contractions is TRUE? Select one: a. Muscle contractions can occur whether Ca2+ concentrations are high or low.  b. Ca2+ binds to the tropin-tropomyosin protein complex shifting it out of the way and allows the myosin to bind to the actin so contraction can occur. c. When Ca2+ concentrations are high, tropomyosin inhibits myosin binding and the muscle is relaxed. d. Ca2+ ions are stored in the sacroplasmic reticulum during the muscle contractions. i do not knwo which one is the answer

Explain in detail why fast-twitch fibers will use anaerobic respiration rather than aerobic respiration even though aerobic respiration is about 20 times more efficient in terms of ATP produced per each glucose molecule?