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Ivahew [28]
3 years ago
12

A person’s pulse rate generally goes down while sleeping. One reason for this cause is

Biology
2 answers:
sveticcg [70]3 years ago
8 0
When a person is not being physically active, like during sleep, the heart rate goes down because you're are not doing anything that requires more oxygen.
Vesnalui [34]3 years ago
6 0
Because the sympathetic nervous system is no longer active following strenuous exercise.
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<span>the answer is C. health issues from wind carried salt </span>
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3 years ago
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What would be the expected effect on plants if the atmospheric CO2 concentration was doubled? What would be the expected effect
Elis [28]

Answer:

C3 plants would have faster growth rates; C4 plants would be minimally affected.

Explanation:

C3 and C4 pathways are the variations of dark reactions of photosynthesis present in green plants. The photosynthetic efficiency of C3 plants is reduced due to the affinity of RuBisCo enzyme for oxygen which in turn leads to the futile pathway of photorespiration. RuBisCo enzyme catalyzes the rate-limiting reaction of the C3 pathway. On the other hand, the C4 plants concentrate CO2 around RuBisCo in their bundle sheath cells of leaves to minimize photorespiration and exhibit higher rates of photosynthesis.

Increased levels of atmospheric CO2 would reduce the photorespiration in C3 plants and would allow them to fix CO2 efficiently due to the increased concentration of CO2 around the enzyme RuBisCo. The increased photosynthetic efficiency would help these plants to exhibit faster growth rates.

However, the photosynthetic rate of C4 plants is not limited by CO2 concentration as they themselves reduce photorespiration by spatial separation of primary carboxylation in mesophyll cell and CO2 fixation in bundle sheath cells. Hence, increased CO2 levels in the atmosphere would not have any impact on their photosynthetic rate and growth.  

4 0
3 years ago
How does crossing over add to the genetic diversity of sexually reproducing organisms?
Alex
<span>It involves random segregation of the homologous chromosomes to each daughter cell.

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7 0
3 years ago
An important research direction in history of physical activity that began taking shape in the 1980s was___________.
Andrews [41]

Answer:

History of exercise and health.

Explanation:

The exercise is important for all the individual as it keeps the individual fit and healthy. The different exercise are performed by the different individuals based on their age, sex and strength.

The research related to the physical health and physical activity was started in 1980's. These researches explains the importance of the exercise and the positive relationship between the health and the exercise. The health benefits of the yogas and asanas are started during this time.

Thus, the answer is history of exercise and health.

6 0
3 years ago
Please help with number two and three!!! Thanks
Anna35 [415]
2 the YY is yellow.
the Yy is yellow 
yy is blue 
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Ss is square 
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3 years ago
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