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Why do veins have valves and why don't arteries have them?

The heart pumps the blood into the arteries with a very high pressure and the blood can therefore travel through them to the tissue of interest. The arteries are also very elastic, therefore they can pulsate...
AC
Answered by Ana C. • Biology tutor
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Why does serum lactate concentration increase during intense exercise in normal individuals?

Skeletal muscle has a variable requirement for energy (ATP) which depends on how hard the muscle is working. During severe exercise, when demand for ATP is high , the muscle can become temporarily starved of...
KS
Answered by Kalvin S. • Biology tutor
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Through what process does oxidative phosporylation, to produce energy using oxygen as a final electron acceptor, occur, and where in the cell?

The electron transport chain, consisting of four complexes that each export hydrogen to the inner membrane space, sets up a electrochemical gradient across the membrane2) The final complex, ATP Synthase, the...
CB
Answered by Chris B. • Biology tutor
1721 Views

Describe the principle of Polymerase Chain Reaction (PCR) and its application in laboratory setting.

Polymerase Chain Reaction is an in vitro method used to amplify DNA fragments. It consists of three main steps, which are: (1) denaturing, (2) annealing, (3) and extension. During denaturation, the double-st...
Answered by • Biology tutor
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Describe the action of competitive inhibitors

Competitive inhibitors permanently halt enzyme action by occupying the active site of the enzyme. They are specific to a particular enzyme due to their specific primary, secondary and tertiary structure.
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Answered by Sarah L. • Biology tutor
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