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What is a cardiac cycle? Cardiac cycle is the term referring to all of the events related to the flow of blood that occur from the beginning of one heartbeat to the beginning of the next. The frequency of the cardiac cycle is the heart rate.
Wiki User
∙ 6y ago
Wiki User
∙ 12y agoNot sure how in depth you want the answer to be :/. The cardiac cycle is how the heart pumps blood around the body.
There's 3 stages of a cardiac cycle; Atrial systole (the 2 atriums contract pushing blood into the ventricles via the atrioventricular valves (tricuspid and bicuspid valves)) then systole (the ventricles contract pushing the blood up through the semi-lunar valves and into the Aorta (on the left side - to the body) and the pulmonary artery (on the right side) and then diastole (where the heart is at rest.)
Wiki User
∙ 15y agoThe 'first' phase is diastole where the heart's atria and ventricles are relaxing and filling up with blood so the volume starts to increase. Then, atrial systole begins, this is when the atria begin to contract to help push blood through the atrioventricular valves into the ventricle. This phase is initiated by the sinoatrial node (AKA SAN or the pace maker). The SAN initiates a small wave of excitement which passes over the atria causing them to contract. Next, the wave of excitement cannot pass through to the ventricles due to the insulating wall. However, the atrioventricular node (AVN) delays the impulse slightly before allowing it down the Purkyne fibres (found in the septum). The Purkyne fibres carry the impulse to the apex of the ventricles. This causes the ventricles to contract, pushing blood through the semilunar valves and into the arteries. This is ventricular systole.
Wiki User
∙ 14y agoPhase 0: membrane potential depolarize cause voltage-gated sodium channels to open, increase the flow of sodium ion in to the cell and increasing membrane potential
Phase 1: the open sodium channels begin inactivate, decreasing the flow of sodium ion into the cell causing the membrane potential to fall slightly. At the same time, voltage-gated potassium channels close whlie voltage-gated calcium channel open, increasing the flow of calcium ion into the cell act to depolarize the membrane potential and curb the fall of membrane potential caused by the inactivation of sodium channels.
Phase 2:known as plateau phase, the membrane remains in a depolarized state. potassium channels stay close, calcium channels stay open.
Phase 3: the internal potential gradually falls to more negative. A subtype of potassium channels open, allow signigicant amount of potassium flow out of the cell. The membrane become repolarized cause calcium and sodium channels close. Membrane repolarizes until resting potential is reach
Phase 4:The period of resting potential until the next depolarization.
Wiki User
∙ 15y agoblood cells are madeoxygen goes into the atriumsorry that's all i no from Kelly Linwood(staffs)
Wiki User
∙ 10y agoAll the activites that take place during one complete contraction and relaxation of the cardiac muscle, including the nerve impulse and the closing and opening of its valves.
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The four phases of the cell cycle are?
The first three phases of the cell cycle are collectively known as Interphase, Mitosis, and Cytokinesis.
What occurs in each 3 main stages of cell cycle?
The three main stages of cell cycle are interphase, mitosis and cytokinensis.Interphase is made up of three stages - G1, S, and G2G1 phase - The first phase of the cell cycleThe cell prepares itself for the synthesis stage of the cell cycle. The cell checks to see if it has all materials required for synthesis.S phase - the DNA is copied so that at the end of this cycle each daughter cell has a complete set of chromosomes.G2 phase - The second growth phase of the cell cycleIn this phase the cell prepares itself for physical separation of the cell to form two daughter cells.MitosisIn this phase the pairs of chromosomes attach themselves to fibers that pull the sister chromatids to the opposite sides of the cell.CytokinensisThe cytoplasm then divides into two forming two daughter cells.
What important event happens in S- Phase of the cell cycle?
DNA replication takes place during the synthesis phase of the cell cycle. The cell also forms a second centrosomeduring this phase.The synthesis phase is often written as S phase. It occurs after the first growth (G1) phase, and therefore about midway through interphase.At the start of the S phase, each chromosome has only one DNA molecule, but by the end of the S phase each has two, which, barring copying errors, are genetically identical, i.e. they have identical base sequences.The doubling of the DNA and the centrosome constitute preparations for a subsequent cell division (mitosis or meiosis). A cell that is not due to divide will not go through an S phase.
Are both sets of valves closed during the cardiac cycle?
Pulmonary and aortic valves are semilunar valves having three semilunar cusps each. these valves open with the free ends facing the vessels when the heart contracts and closes when heart relaxes thus preventing regurgitation
What is the stages of the cell cycle?
The stages in the Cell cycle are: g1 (growth stage 1) s phase (synthesis of Dna pair strand) g2 (growth stage 2) Mitosis (mitosis has 4 phases, prophase, metaphase, anaphase, and telophase) Cytokinesis is involved in each of the above.
Each complete heart beat is called what?
cardiac cycle
Identify the phase of the cardiac cycle to each of the following systolic pressure and diastolic pressure?
Systolic Pressure occurs during ventricular ejection.Diastolic Pressure occurs during ventricular relaxation.
What is the duration of the cardiac cycle?
It depends on the heart rate. You take 72 beats per minute. Then the duration of one beat is 75 per minute. Then each beat will take 0.8 second to complete. This is taken duration of the cardiac cycle. You take 100 beats per minute. Then each beat will take 0.6 second to complete. This duration will be the duration of the cardiac cycle.
The maximum arterial pressure during each cardiac cycle is the?
systolic pressure
The volume of blood pumped during each cardiac cycle is called what?
That is called the stroke volume.
What happens in the cell and to the tetrads in each phase?
it stays
What are the steps in the water cycle and what happends at each step?
What are the steps in the water cycle and what happens at each step
What is happens during the s phase of the cell cycle?
DNA is replicated.
Why phase difference is 120?
Phase difference is 120 degrees because that is one third of 360 degrees. In a multi phase power system, you want each phase to divide a full cycle evenly. So, in a three phase system, each phase is delayed by one third of a cycle. A full cycle at 60 Hz is 16.7 mS, or 360 degrees. One third of that is 5.6 mS, or 120 degrees. A full cycle at 50 Hz is 20 mS, or 360 degrees. One third of that is 6.7 mS, or 120 degrees.
The four phases of the cell cycle are?
The first three phases of the cell cycle are collectively known as Interphase, Mitosis, and Cytokinesis.
What occurs during the phase of the cell cycle?
A cell's DNA is copied during this phase. At the end of this phase, each chromosomes consists of two chromadtids attached at he centromere.
Why cardiac tissue cannot repair itself after damage?
Briefly describe why cardiac tissue cannot repair itself after damage? Cardiac muscle lacks stem cells and mature cardiac muscle fibers cannot go through mitosis. This is a network of specialized cardiac muscle fibers that provide a path for each cycle of cardiac excitation to progress through the heart.
