Answer:The above statement is "false".
Explanation:
The following events take place during contraction-relaxation of a muscle:
•Action potential in T tubule activates voltage-sensitive receptors,which in turn trigger Ca ions release from terminal cisternae of sacroplasmic reticulum(SR) into cystol.
•Ca ions bind to troponin;troponin changes shape,removing the blocking action of tropomyosin;actin active sites is exposed.
•CONTRACTION; myosin heads alternatively attach to actin and detach,pulling the actin filaments toward the center of the sarcomere;using ATP in this process.
•removal of Ca ions by active transport into the SR after the action potential ends.
•RELAXATION occurs.Actin and myosin return back to its unbound state.
- During Systole, the arterial pressure is maximum ,so option c is correct.
- During isovolumetric relaxation, AV and semilunar valve opens and the ventricular pressure decrease.
- The human heart's activity from the start of one heartbeat to the start of the next is known as the cardiac cycle. It consists of twophases: a diastole, in which the heart muscle relaxes and re-fills with blood, and a systole, in which the heart muscle contracts forcefully and pumps blood. The heart quickly relaxes and expands after emptying to receive a second inflow of blood returning from the lungs and other body systems, then contracts to send blood back to those systems. A healthy heart must fully expand before it can once again pump effectively.
- Isovolumetric relaxation is the second heart sound is produced when the aortic and pulmonary valves close when the ventricular pressures fall below the diastolic aortic and pulmonary pressures (80 mmHg and 10 mmHg, respectively) . The start of diastole is indicated by this.
So, Ventricular contraction and Isovolumetric relaxation gets distinguished by their specific characteristics.
To know more about systole, please refer:
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Answer:
what type of qustion is this
Explanation:
Answer:
The mother's cardiovascular system and the placenta.
Explanation:
Babies receive their oxygen and get rid of the carbon dioxide with the help of both the cardiovascular system of the mother and the placenta. The gases dissolve through the placenta and then gets exchanged in the cardiovascular system of the mother. So the answer is the mother's cardiovascular system and the placenta.
I hope this answer helps.
