What neural or hormonal signal caused the change in MAP observed with prolonged muscle contraction?  (select all that apply) -Decreased ACh -Increased ACh -Increased EPI/NE -Decreased EPI/NE

The following is an oscilloscope tracing displaying the muscle twitch of an intact, viable frog skeletal muscle. The muscle was stimulated via electrodes placed on the muscle at time zero and again at 75 msec. Which of the following physiological phenomena does this demonstrate? Force 0 20 treppe fatigue fused tetanus wave summation 120 Time (msec) 2015 a 180 200

High blood K+ concentrations cause depolarization of the restingmembrane potential. Predict and explain the effect of high blood K+levels on smooth muscle function

When motor units are recruited to participate in tension development in a muscle, the order of recruitment is typically: Question 13 options:   from slow twitch to fast twitch   from fast twitch to slow twitch   it depends on the type of contraction   related to the size and shape of the muscle

A&P1 Explain the difference between concentric and eccentric muscle contractions and give an example of an exercise or activity using each.

Ca2+ does not play a role in muscle relaxation true or false

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.

tudent forgot to add GelRed in to the gel mixture when he prepared the Agarose Gel. What will be the problem caused by his mistake?     A) He will not be able to securely deposit his samples in the wells, the samples will disperse into the buffer     B) The student will have a hard time visualizing how far his samples have traveled in the gel to disconnect the power supply in time     C) The student will not be able to visualize the DNA under the UV light     D) The student 's DNA will get degraded during the process of electrophoresis     E) More than one of the answer choices are correct

Discuss the similarities and differences by which Ca2+ activity is involved in initiating muscle contraction in skeletal versus smooth muscle fibers (hint: include Ca2+ sources, proteins it binds to, and signaling cascade it activates leading to contraction). (please explain in sentences, max 12 sentences)

Without acetylcholine esterase (AChe) will the action of skeletal muscle increase, decrease or not change? Why?