At a stimulation frequency of 15 Hz how many stimuli were there per second? RESULTS See Table 4: Measurement of Threshold Stimulus See Graph: Effect of Stimulation Value on Twitch Contraction Force 1. What is the threshold stimulus? 2. What is the maximum force generated at the threshold stimulus?
LABORATORY REPORT Activity: Recruitment and Isotonic and Isometric Contractions Name: Carolyn Chrzastowski Instructor: Professor Waite Date: 07.19.2015 Predictions When the arm goes from resting to flexing, the amplitude and frequency of sEMG spikes will increase During flexion, the amplitude and frequency of sEMG spikes will ___ during extension. be greater than Recruitment of motor units will be greatest when the load is 20 pounds Materials and Methods Comparison of motor unit activation during muscle tone and concentric and eccentric isotonic contractions Dependent Variable amplitude and frequency of sEMG spikes Independent Variable muscle movement Controlled Variables total number of motor units
Dependent Variable. amplitude and frequency of sEMG spikes 2. Independent Variable. muscle load 3. Controlled Variables.
UNIT 3 OUTCOME 2 TOPIC 4 ACUTE RESPONSES TO EXERCISE FOR STARTERS………. [pic] ____________________________________________________________ _________ EXTRA THINGS THAT I HAVE HEARD or PERHAPS SEEN…………………………. |[pic] |[pic] | |Changes undertook by the respiratory system during exercise: | |Minute ventilation (the amount of air moving in and out of the lungs per minute, this increases in direct proportion to the | |metabolic demands of the body) | |Minute
Predictions During exercise HR will increase During exercise SV will increase During exercise CO will increase Materials and Methods Dependent Variable EDV, ESV, and cardiac cycle length Independent Variable level of physical activity (resting or exercise) Controlled Variables age, weight, height, health, gender 4. What instrument was used to measure cardiac volumes? MRI, ECG 5. Does the instrument used to measure cardiac volume use X-Rays? Explain.
Each time a cross-bridge from the myosin filament releases from an actin filament energy is used. Therefore, the more muscle tissue you have,and the more you use it, the greater your energy expenditure'which is also caloric expenditure. 5.) Define and describe concentric and eccentric muscle actions. Define motor unit.
Case Study Questions: 1.) Explain the renin-angiotensin-aldosterone system. When the kidneys sense decreased profusion pressure, they try to increase this pressure by increasing blood volume through the renin-angiotension-aldosterone system. Once the decreased pressure is sensed renin is released, which increases conversion of angiotension to angiotension I. Angiotension I is in turn converted to angiotension II by the angiontension converting enzyme (ACE). Angiotension II causes vasoconstriction, which raises the blood pressure.
Calcium ions then spread into the synaptic bulb, and Ach is released by vesicles into the synaptic cleft. Na+ ions go into the channels and K+ leaves. Na+ sets up action potential on the sarcolemma, and the muscle fiber is provoked. The action potential travels to the T tubules, and Ca2+ is released into the sarcoplasm. Ca2+ binds to the troponin, which results in a movement in the tropomyosin.
This will cause an action potential to spread down to the T- tubules and “electrical chemical signals = shocks” the sarcoplasmic reticulum into releasing calcium ions. Then the calcium is released from the sarcoplasmic reticulum to the sarcoplasm. 5. Calcium is restored/ reused in the sarcoplasmic reticulum. Just as concentration results from the release of calcium ions stored in the sarcoplasmic reticulum, contraction ends and relaxation begins as Calcium is
My temperature increased because of the high amount of heat I produced. So basically the mitochondria in my cells helped my body to turn nutrients and oxygen into energy. So every time I contracted my muscles during the