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Nastasia [14]
3 years ago
6

Why SA node called pacemaker of heart

Biology
2 answers:
zhannawk [14.2K]3 years ago
8 0
<h2>ANSWER:</h2>

It controls the heart rate by producing electrical impulses

<h2>EXPLANATION:</h2>

It controls the heart rate by producing electrical impulses and later transmitting electrical signals through the heart muscle, creating the heart to contract and pump blood everywhere into the body. The heartbeat originates from the S.A. node and expands to the walls of auricles which contract.

stich3 [128]3 years ago
3 0
SA Node<span> which is also known as the sinus node, is the natural pacemaker of the heart. It controls the heart rate by generating electrical impulses and then sending electrical signals through the heart muscle, causing the heart to contract and pump blood throughout the body. </span>

The SA Node is located in the outer layer of the right atrium of the heart, near the superior vena cava. It is made up of a group of cells (myocytes) positioned on the wall of the right atrium, at the center of the heart and near the entrance of the superior vena cava. These cells contract at a rate of about 70-80 times per minute, which make up the natural heart beat.



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Imagine a genetic counselor working with a couple who have just had a child who is suffering from Tay-Sachs disease. Neither par
Alexxx [7]

Answer:

C. "Because you have had one child with Tay-Sachs, you must each carry the allele. Any child you have has a 25% chance of having the disease

Explanation:

Tay-Sachs disease is an autosomal recessive disorder that means a child will acquire the phenotype or we can say disease only when both the alleles which cause disease are present in the child.

Here, in this condition neither parent has Tay-Sachs but they gave birth to a child who is suffering from the disease then it simply means that both the parents are carrier of this disease i.e. they both are heterozygous.

The cross and probability of healthy and diseased child is shown as under:

                          Mother        Father

Parents                    Tt               Tt

                              /        |          |     \

Off-springs         TT      Tt       Tt      tt

<u>Out of these 4 probable off-springs only 3 with genotype TT, Tt & Tt  will be healthy while the 1 with genotype tt will be diseased.</u><u> </u><u>So, the probability of diseased child is 1/4 which is 25%. </u>

Also, the birth of children is an independent event so if one child has already been born with this disease then it doesn't mean that the next 3 children will be healthy for sure i.e. birth of first child cannot influence the next child. In short we can also say that in the next birth, there is still 25% chance of the child being born with this disease because previous birth has nothing to do with next birth.

7 0
3 years ago
74) one difference between cancer cells and normal cells is that cancer cells; a) are unable to synthesize dna.; b) are arrested
Natasha_Volkova [10]
C. <span>continue to divide even when they are tightly packed together.
Hope this helps(;</span>
3 0
3 years ago
Which component of the circulatory system is at the tissue level?
Nadya [2.5K]

Blood is considered to be a tissue and it is part of the circulatory system.


The human circulatory system functions to transport blood and oxygen from the lungs to the various tissues of the body. The heart pumps the blood throughout the body. The lymphatic system is an extension of the human circulatory system that includes cell-mediated and antibody-mediated immune systems.



4 0
3 years ago
Read the questions below. Check all of the scientific questions.
irga5000 [103]

Answer:

The  following are examples of scientific questions

      How fast do cheetahs run?

      Does adding fertilizer to the soil help plants grow faster?

      What do pelicans eat?

      Why are my neighbors going to the mall?

Explanation:

An essential part of science is asking questions.  

A good scientific question is that it can be  answered by direct observations or with scientific tools.

      How fast do cheetahs run?

      Does adding fertilizer to the soil help plants grow faster?

      What do pelicans eat?

      Why are my neighbors going to the mall?

Examples of questions that are not scientific  are based on values or opinions like what people believe is right or wrong, or beautiful or ugly.

      Do fish like living in aquariums?

      Does my dog like her bone better than her Frisbee?

3 0
3 years ago
PLS HELP MEEE WILL MARK BRAINLYEST What has developed as a result of population growth around Cape Canaveral due to the space pr
Gennadij [26K]

Answer:

New Homes

Explanation:

Without building additional housing for the people you wish to have there, it is impossible to increase the population.

4 0
1 year ago
Read 2 more answers
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