Answer:
The correct order is:
- Electrical signal travels toward the heart
.
- Signal received by the nodes in the atrium
.
- The atria contract
.
- Signal received by the atrioventricular node.
- Signal transferred to the ventricles
.
- The ventricles contract
.
Explanation:
The steps are:
- <em>Signal transferred to the ventricles
.</em>
- <em>The atria contract
.</em>
- <em>Electrical signal travels toward the heart
.</em>
- <em>The ventricles contract
.</em>
- <em>Signal received by the nodes in the atrium
.</em>
- <em>Signal received by the atrioventricular node.</em>
The question refers to the heart's physiological electrical conduction mechanism, which goes from the atrial node to the atrioventricular node, passes to the bundle of His and its branches, and then extends through the Purkinje fiber system, all so that coordinated events occur that allow blood flow within this organ.
The correct order of steps, linked to the activity of the heart and blood flow are:
- <u>Electrical signal travels towards the heart</u>: the autonomic nervous system conducts the nerve impulse to the heart.
- <u>Signal received by the nodes in the atrium</u>: the atrial node, a structure that is located on the right atrium, receives the nerve impulse and is responsible for transmitting it to the ventricular atrial node.
- <u>The atria contract:</u> the contraction of this structure drives the blood to the ventricles, promoting the simultaneous opening of the atrioventricular valves.
- <u>Signal received by the atrioventricular node</u>: a node located in the interventricular septum is responsible for the distribution of the impulse to the His-Purkinje system.
- <u>Signal transferred to the ventricle</u>s: the nerve signal passes to the His bundle, its branches and then the Purkinje fibers found in both ventricles.
- <u>The ventricles contract</u>: ventricular contraction promotes the emptying of your cavities, passing blood from the right ventricle to the lungs, and from the left ventricle to the general circulation. At this time the atrioventricular valves are closed and the sigmoid valves are opened, to allow anterograde blood flow.
Learn more:
Movement of oxygenated blood leaving the heart brainly.com/question/2375870
Answer:
See the answer below
Explanation:
Let the disorder be represented by the allele a.
Since the disease is an autosomal recessive one, affected individuals will have the genotype aa and normal individuals will have the genotype Aa or AA.
Since the four adults are carriers, their genotypes would be Aa.
Aa x Aa
Progeny: AA 2Aa aa
Probability of being affected = 1/4
Probability of being a carrier = 1/2
Probability of not being affected = 3/4
(a) The chance that the child second child of Mary and Frank will have alkaptonuria = 1/2
(b) The chance that the third child of Sara and James will be free of the condition = 3/4
(c)
(d) If someone has no family history of the disorder, their genotype would be AA.
AA x aa
4 Aa
<em>The chance that a child with alkaptonuria will have an offspring with alkaptonuria if the child's mate has no family history </em>= 0
(e)
(f) <em>The chance that a child with alkaptonuria will have an offspring with alkaptonuria if the child's mate has no family history</em> = 0
ACTIVE TRANSPORT: uses energy and require a ligand to bind with receptors.
DIFFUSION: allows small, nonpolar molecule (like oxygen) to move across a cell membrane. It doesn't require energy.
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The H.M.S beagle and to form scientific theories