0
PHASE0(RAPID DEPOLARIZATION)
due to opening of fast voltage gated sodium channels
PHASE1(INITIAL REPOLARIZATION)
due to closure of sodium channels while loss of potassium is goingon ,making the cell polarized.
PHASE2(PLATEAU)
due to opening of calcium channels. influx of calcium neutralizes the effect of out going potassium so prolonged plateau is achieved.
PHASE3(FINAL RE POLARIZATION)
due to closure of calcium channels and continue loss of potassium makes the inside of cell more negative resulting in polarization.
PHASE4(RMP)
eventually cell returns to resting membrane potential due to K efflux and cell is ready for next cycle
What else can I help you with?
Blood pressure rises and falls in a pattern corresponding to the phases of the?
Cardiac Cycle
What are phases of the cardiac cycle that shortens most in response to tachycardia?
The diastolic phase of the cardiac cycle shortens the most in response to tachycardia. This includes the time spent in ventricular filling (diastasis) and atrial contraction (atrial systole), as these phases are compressed to accommodate the faster heart rate.
What is the alternating relaxation and contraction of the heart called?
Diastole is the relaxation phase. Systole is the contraction phase. If you put these phases together you have the Cardiac Cycle...
how does the concentration of sodium and potassium affect the resting hyper polarization and depolarization membrane potentials?
The concentration of sodium (Na⁺) and potassium (K⁺) ions significantly influences resting membrane potentials and their hyperpolarization/depolarization phases. An increase in extracellular Na⁺ can lead to depolarization, as more Na⁺ enters the cell when sodium channels open, making the interior more positive. Conversely, higher intracellular K⁺ concentrations promote hyperpolarization when K⁺ channels open, allowing K⁺ to exit the cell and making the interior more negative. Thus, the balance of these ion concentrations is crucial for maintaining the resting membrane potential and regulating excitability in neurons and muscle cells.
What happens as the moon revolves around the earth?
we get different phases of the moon
What is the period of time called between the beginning of one heartbeat and the start of the next?
The period of time between the beginning of one heartbeat and the start of the next is known as the cardiac cycle. It consists of two phases: systole (contraction of the heart muscles) and diastole (relaxation of the heart muscles).
What are the four phases of cardiac cycle?
The four phases of the cardiac cycle are diastole, isovolumetric contraction, systole, and isovolumetric relaxation. During diastole, the heart muscles relax and the chambers fill with blood. In isovolumetric contraction, the heart muscles contract but the chambers do not change volume. Systole is when the chambers contract and blood is ejected. Finally, isovolumetric relaxation is when the heart relaxes but the chambers do not change volume.
What are the phases of exercises?
The phases are: 1) Warm-Up, 2) Conditioning, and 3) Cool Down. This can be found in more detail at the Clevend Clinics' Cardiac Rehab exercise page. Hope this helps you...Regards, Ray Siegel, MCP,LP
What happens during each of the four phases of the menstrual cycle?
u bleed
When you take someone's blood pressure you are measuring the pressure during the contraction and relaxation phases of the heart muscle?
true
What is the name of a muscle that is stimulated so frequently that relaxation phases are completely laminated is set to exhibit what?
Complete tetani
What are the phases of the cardiac cycle?
Mid-to-late diastole, ventricular systole and early diastole
