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3 years ago

What is the purpose of the pericardial sac that surrounds the heart in mammals

Biology

1 answer:

Nitella [24]3 years ago

6 0

Answer:

Pericardial sac has protective tole

Explanation:

Pericardial sac or pericardium is a fibrous tissue that surrounds the heart. It has two coats:

the outter coat-parietal pericardium
the inner coat-visceral pericardium or epicardium which is double-layered and contains pericardial fluid between those two layers (pericardial fluid is necessary as a lubricant for the heart movement).

Besides lubrication, percardium also protects heart from infections, fixes it and limits its movements.

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What is an example of a structure that is found in both prokaryotes and eukaryotes?.

Alex Ar [27]

Plasma membrane is an example of a structure that is found in both prokaryotes and eukaryotes

Another of of structure which is common to both prokaryotes and eukaryotes is cell wall

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2 years ago

Why is a nutrient cycle on earth called closed system

anastassius [24]

Answer:

The nutrient cycle is nature's recycling system. All forms of recycling have feedback loops that use energy in the process of putting material resources back into use. Recycling in ecology is regulated to a large extent during the process of decomposition. Ecosystems employ biodiversity in the food webs that recycle natural materials, such as mineral nutrients, which includes water. Recycling in natural systems is one of the many ecosystem services that sustain and contribute to the well-being of human societies.

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I have Bolded important facts aswelll

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3 years ago

What four characteristics of an aquatic environment might make photosynthesis or life processes difficult for aquatic plants? Li

elena55 [62]

Answer:

Hello there, I will give the answer

Explanation:

Aquatic plants require special adaptations for living submerged in water, or at the water's surface. The most common adaptation is the presence of lightweight internal packing cells, aerenchyma, but floating leaves and finely dissected leaves are also common.

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3 years ago

Please help me I do not know how

Gnom [1K]

Liquid 1 and 4, because they have the same melting point and density.

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2 years ago

Directions: Consider a pedigree that is tracking an autosomal recessive trait, where two recessive alleles (tt) result in the in

Talja [164]

Answer:

I think this should be the chart you were interested in...

Explanation:

Individual Shape in shaded

phenotype pedigrees

Male with gen. TT PTC taster square No

Male with gen. Tt PTC taster square No

Male with gen. tt Non-taster square Yes

Female with gen. TT PTC taster Circle No

Female with gen. Tt PTC taster Circle No

Female with gen. tt Non-taster Circle Yes

*gen- genotype

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2 years ago