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Natasha_Volkova [10]
3 years ago
8

Which of the following is true of annelids? a) They have a gastrovascular cavity. b) They have an open circulatory system. c) Th

ey have a nerve net. d) They have pseudocoeloms. e) They perform gas exchange across their skin.
Biology
1 answer:
Olin [163]3 years ago
7 0

Answer:

e) They perform gas exchange across their skin.

Explanation:

Annelids are organisms which are invertebrates and are worms. Examples

Include earthworm, rag worm and leeches.

They don’t have a gastrovascular cavity. They don’t have an open circulatory system, instead it operates on a closed circulatory system.They lack pseudocoeloms which is the space between the endoderm and mesoderm. They however exchange gases through their moist skin.

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At what point do the pulmonary and systemic circulation systems meet up?
Hitman42 [59]

Answer: The Heart

Explanation:

The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. It consists of the heart and the blood vessels running through the entire body. The arteries carry blood away from the heart; the veins carry it back to the heart. The system of blood vessels resembles a tree: The “trunk” – the main artery (aorta) – branches into large arteries, which lead to smaller and smaller vessels. The smallest arteries end in a network of tiny vessels known as the capillary network.

There are two types of blood circulatory system in the human body, which are connected: The systemic circulation provides organs, tissues and cells with blood so that they get oxygen and other vital substances. The pulmonary circulation is where the fresh oxygen we breathe in enters the blood. At the same time, carbon dioxide is released from the blood.

Blood circulation starts when the heart relaxes between two heartbeats: The blood flows from both atria (the upper two chambers of the heart) into the ventricles (the lower two chambers), which then expand. The following phase is called the ejection period, which is when both ventricles pump the blood into the large arteries.

In the systemic circulation, the left ventricle pumps oxygen-rich blood into the main artery (aorta). The blood travels from the main artery to larger and smaller arteries and into the capillary network. There the blood drops off oxygen, nutrients and other important substances and picks up carbon dioxide and waste products. The blood, which is now low in oxygen, is collected in veins and travels to the right atrium and into the right ventricle.

This is where pulmonary circulation begins: The right ventricle pumps low-oxygen blood into the pulmonary artery, which branches off into smaller and smaller arteries and capillaries. The capillaries form a fine network around the pulmonary vesicles (grape-like air sacs at the end of the airways). This is where carbon dioxide is released from the blood into the air inside the pulmonary vesicles, and fresh oxygen enters the bloodstream. When we breathe out, carbon dioxide leaves our body. Oxygen-rich blood travels through the pulmonary veins and the left atrium into the left ventricle. The next heartbeat starts a new cycle of systemic circulation. Below is an attachment of a diagram that explains the connection between pulmonary and systemic circulation from google.

5 0
3 years ago
Explain why white blood cells are NOT used for blood typing.
adelina 88 [10]

Answer:

Leukocytes are a hindrance in a blood transfusion. They can be filtered out and improve a blood transfusion.

Explanation:

:))))))))))))))))))))))))))

7 0
2 years ago
Elephant seals are abundant in their population size but they have low genetic diversity within their species due to overhunting
Anastasy [175]
<h2>Genetic diversity </h2>

Explanation:

If the environment changes, the species runs the risk of not having the genetic diversity to be adaptable to that change and could go extinct

  • Genetic diversity is the diversity  or genetic variability within species
  • The huge variety of different gene sets defines an individual or a whole population's ability to tolerate stress from any given environmental factor
  • While some individuals might be able to tolerate an increased load of pollutants in their environment, others carrying different genes might suffer from infertility or even die under the exact same environmental conditions;the former will continue to live in the environment the latter will either have to leave it or die
  • Any change in the environment - natural or human induced causes a selection of events that only the fittest survive
  • In case of elephant seals,overhunting reduces the sum of genes available,thus leaving behind a population that is less capable of tolerating any further natural or human disturbances in environment
  • The loss of genetic diversity within a species can result in the loss of useful and desirable traits  
8 0
3 years ago
What part of the atp cycle are analogous to saving money?
amid [387]
The part of the ATP cycle in which analogous on spending money is ATP is broken down by water to ADP, energy and P. ATP or adenosine triphosphate is defined as a nucleotide that performs many essential roles in the cells and it is also an energy source that is used in living things.
7 0
3 years ago
plz help!!! If this is a sequence of one DNA strand, what is the complementary sequence of the other DNA strand? DNA: A T T C A
gizmo_the_mogwai [7]

Answer:

T A A G T C G C T

Explanation:

DNA strand:                             A T T C A G C G A

complementary DNA strand:  T A A G T C G C T

This is a very important rule:

Four kinds of nitrogenous bases in DNA: Adnine (A), Thymine (T), Guanine (G), Cytosine (C)

And this is how they're coupled:

A = T

C = G

For example::

First DNA strand:                  A T G C

complementary strand:        T A C G

5 0
2 years ago
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