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3 years ago

In 2007, New York City attempted to install a commercial wave farm

Biology

1 answer:

Gre4nikov [31]3 years ago

3 0

Answer:

Because of the fact that it was very Deep and heavily polluted.

Explanation:

Actual main channel depths along the river vary; with a least depth of 24' or less at a few locations at the channel edges to a maximum depth of 108' being found mid-channel at the southern approach to Hell Gate.

Due to heavy pollution, the East River is dangerous to people who fall in or attempt to swim in it, although as of mid-2007 the water was cleaner than it had been in decades.

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<h3>What is cytotoxic T cell?</h3>

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Q1 What is the correct sequence an impulse travels through the four components of the heart’s nodal system?

Likurg_2 [28]

Answer:

<em>1. The correct sequence in which an impulse travels through the heart’s nodal system is SA node, AV node, bundle of HIS and Purkinje fibers (B-C-A-D)</em>

<em>2. The structure that depolarizes next after the AV node is bundle of HIS.</em>

<em> 3. Soon after the onset of ventricular systole the semilunar valves open.</em>

Explanation:

1. The conduction system of the heart -nodal system- is what allows myocardial contraction, which translates into heartbeat and pumping of blood.

This conduction system begins in the sino-atrial node (SA), which is located in the upper portion of the right atrium, and is regulated by the autonomic-sympathetic and parasympathetic nervous system.
The impulse generated in SA passes to the atrioventricular node (AV) that is located in the interventricular septum (IVS).
From AV, impulse passes to the His-Purkinje system, formed by the bundle of His, which runs along the IVS and is divided into two branches, right and left.
Purkinje fibers are born from each of the bundles of His bundle, and are distributed through the right and left ventricles.

2. As a result of the depolarization that occurs in the atrioventricular node - which undergoes a brief interruption in its path - depolarization continues in the bundle of His, which runs through the rest of the interventricular septum to divide into two branches, the right and the left.

The left branch is usually subdivided into three fascicles, the left anterior, left posterior and a central branch. Purkinje fibers are born from each of these branches and fascicles, which stimulate myocardial contraction.

3. Ventricular systole consists of contraction of the myocardium, which leads to boost blood contained in the ventricles to the lungs or general circulation. In this phase of the cardiac cycle, the semilunar valves - which allow access to the pulmonary and aortic arteries - open, which produces the second cardiac noise.

Other events that occur during systole are the increase in ventricular pressure and the closure of the atrioventricular valves (AV), to prevent ventricular blood from returning to the atria.

Learn more:

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