D: fronds
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<h2>The Cardiac cycle</h2>
Explanation:
Correct order is: 3,5,6,4,2,1,8,7
The cycle of events that happen in a single heart beat is called Cardiac cycle. Basically, it refers to repeated pattern of contraction and relaxation of the heart.The contraction of heart is called systole and the relaxation of heart is called diastole. The cardiac cycle includes systole and diastole of atria as well as systole and diastole of the ventricles. When heart rate is about 75 beats per minute, a cardiac cycle takes 0.8 seconds.
The order of events is cardiac cycle is :
- beginning of atrial systole
- completion of ventricular filling.
- beginning of ventricular systole.
- closure of AV valve.
- isovolumic contraction.
- opening of semilunar valve.
- ventricular ejection.
- ventricular relaxation.
<u>Answer</u>:
Breaking down of pyruvate occurs during the Krebs cycle
<u>Explanation:</u>
Krebs cycle being the most important process of aerobic respiration. During kreb’ s cycle pyruvate is broken down to acetyl CoA which interacts with oxaloacetate to form the first metabolite of Krebs cycle known as citrate which contain 3 -COOH group That’s why kreb’ s cycle is also termed as Tricarboxylic acid cycle. The kreb’ s cycle happens in the mitochondrial matrix and generates a lot of chemical energy such as (ATP, NADH, FADH2) by the process of oxidation of the pyruvate and which is also measured as the end product of glycolysis.
Answer:
Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages.
Explanation:
That's because all cells are surrounded by a structure called the cell membrane — which, much like the walls of a house, serves as a clear boundary between the cell's internal and external environments.
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