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True [87]
3 years ago
10

What is the sa node of the heart

Biology
1 answer:
olasank [31]3 years ago
5 0

Its a cluster of cells that are situated in the upper part of the wall of the right atrium.

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The lungs remain inflated because ___________.a. intrapleural pressure is exactly equal to atmospheric pressure b. intrapleural
kkurt [141]

Answer:

Option C,  Intrapleural pressure is less than intrapulmonary pressure

Explanation:

During inspiration, the air enters the lungs due to lower pressure in the intrapulmonary or intra-alveolar  than the atmospheric pressure. During quite respiration, the intrapulmonary pressure reduces to a pressure that is 3 mm Hg lower than that of atmospheric pressure. During quiet expiration, the intrapulmonary pressure rises up to a pressure that is 3 mm Hg higher than that of atmospheric pressure. This leads to lack of air in the intrapleural space thereby producing intrapleural pressure which is lesser than that of intrapulmonary pressure.  

This difference in pressure (i.e higher pressure with in the lungs than the atmosphere)  causes lungs to remain attached to the chest wall and hence looks inflated.  

Hence, option C is correct

8 0
3 years ago
In a molecule of water, the electrons are more strongly attracted to the hydrogen nuclei than to the oxygen nucleus. Therefore e
Bess [88]

Answer:

Pretty sure it's false.

3 0
3 years ago
Sandra is heterozygous for eye shape.
amid [387]

Awnser:

She has two different alleles for eye shape, one from each parent

You always receive 1 allele from each parent, and you're heterozygous, those alleles are different.

6 0
3 years ago
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How does paving and concreting areas affect watersheds?
dezoksy [38]

Answer:

As the amount of impervious paved surfaces increase, watersheds become more vulnerable to pollutants. When rains fall on a conventionally paved impervious surface, the precipitation is generally directed down storm drains, which can result in flooding and overwhelming the storm water management system.

Explanation:

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Some species of penguins, such as chinstrap penguins, depend on open water for their survival. Other species of penguins, such a
prisoha [69]
Some species of penguins, such as chinstrap penguins, depend on open water for their survival. Other species of penguins, such as Adélie penguins, depend on ice. Over the last 20 years, the population size of chinstrap penguins has increased, and the population size of Adélie penguins has decreased. An increase in global air and water temperatures likely caused <span>these changes in population size.</span>
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3 years ago
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