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solmaris [256]
1 year ago
12

Which component of the electrocardiogram represents the duration of ventricular contraction?

Biology
1 answer:
Advocard [28]1 year ago
5 0

QRS complex refers to the combination of the Q, R, and S waves, and indicates ventricular depolarization and contraction (ventricular systole).

Ventricular rate can be calculated by determining the time interval between QRS complexes. The duration of the QRS complex is normally 0.06 to 0.10 seconds. This relatively short duration indicates that ventricular depolarization normally occurs very rapidly.

P QRS and T waves in electrocardiogram signifies the P wave in an ECG complex indicates atrial depolarization. The QRS is responsible for ventricular depolarization and the T wave is ventricular repolarization.

To learn more about ventricular depolarization  , here

brainly.com/question/10577559

#SPJ4

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What are similar structures that evolved independently called?
Ilia_Sergeevich [38]

Answer:

Analogous structures

Explanation:

These structures are similar but not derived from the common ancestor like homologous structures. Analogous structures are formed as a result of convergent evolution-type of evolution in which organisms develop on similar way but independently. An example of analogous structures are wings. Birds, insects and bats all have wings, with the same purpose (flight) but they evolved in their own way.

4 0
3 years ago
Which of these would be considered a transgenic organism? a human treated with insulin produced by E. coli bacteria a rat with r
MA_775_DIABLO [31]

Answer:

a rat with rabbit hemoglobin genes

Explanation:

When the genome of an organism is modified in the field of genetic engineering,by transplanting the gene(DNA) from one organisms to another,(by vectors) or alteration of the gene components,the resulting organism produced or formed is called Transgenic organism.

This process of genetic engineering makes use of recombination of genes to alter the genome of the transgenic organism.

Thus by transferring to  rat ( the DNA for Hb) as the  rabbit Hb,the gene( or genome) for producing Hb in tats has been modified by that of rabbit.Hence Rat is said to transgenic.

Besides animals crop plants are also genetically modified.Thus the genome of some crops are altered to resist herbicides and pesticides. Some species of rice (golden rice)have been  modified to  add certain  vitamins to improve the nutritional values.

Genetically modified bananas as edible vaccines are another example

3 0
3 years ago
Do protists have cell walls? If so, what is it made of?
Umnica [9.8K]
Yes, protists have cell walls.

Protists cell walls are made of composed cellulose, protein strips , and silica

For some protists, we can even found components like pectin on the cell walls

hope this helps
6 0
3 years ago
Read 2 more answers
Why is a lagging strand not needed during protein synthesis?
elena55 [62]

Answer:

template 5'->3"

Explanation:

As we all know, with a linear chromosome, on the lagging strand (template 5'->3') of DNA replication, when the last piece of RNA primer at the 3' end is removed, the DNA cannot be extended and this creates the end replication problem.

5 0
3 years ago
The diagram below shows a food web in a woodland.
gregori [183]
Y is the best options because a secondary consumer will eat a primary consumer for energy (the grass hopper).
7 0
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