Assisted stretching requires a partner.
Cats breathe faster when they purr because the act of purring requires the contraction and relaxation of muscles in their diaphragm, which can lead to an increase in their breathing rate.
Anerobic contraction of muscles.
Inhalation requires the contraction of the diaphragm, which takes ATP. Exhalation is simply the passive relaxation of that muscle, in which the atmospheric pressure causes the lung to deflate, taking no ATP.
Excitation-contraction coupling in muscle cells requires calcium ions (Ca2+), ATP (adenosine triphosphate), and voltage-gated ion channels. The release of Ca2+ from the sarcoplasmic reticulum triggers muscle contraction by binding to troponin, which allows myosin to interact with actin filaments. ATP provides the energy needed for muscle contraction and relaxation processes. Voltage-gated ion channels help propagate action potentials along the muscle cell membrane, leading to the release of Ca2+ from the sarcoplasmic reticulum.
Because lifting weights requires actual weights it puts resistance on the muscles to make them stronger bigger and more durable unlike stretching, these two are completely different from each other.
There's is a contraction of "there is" and requires an apostrophe.
Ca2+ and ATP
Inhalation requires the contraction of the diaphragm, and exhalation occurs when it relaxes.
Excitation-contraction coupling in muscle cells requires the propagation of an action potential along the sarcolemma, which triggers the release of calcium ions from the sarcoplasmic reticulum. The binding of calcium ions to troponin exposes binding sites on actin, allowing myosin to bind and initiate muscle contraction.
The question 'Whose this?' is not correct.Using the interrogative pronoun 'whose' requires a verb:'Whose is this?'Using the pronoun contraction for 'who is' requires an apostrophe: 'Who's this?'
Stretching a strong spring requires more work because it has a higher spring constant, meaning it resists deformation more than a weak spring. The work done in stretching a spring is directly proportional to the square of the distance it is stretched, so a strong spring will require more work to stretch the same distance as a weak spring.