Which best describes a tetrad?

1 answer:

6 0

A tetrad is a foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids

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Cardiovascular effects of the sympathetic division include all of the following EXCEPT ________. a. weak dilation of the blood v

dalvyx [7]

Answer:

d. dilation of the blood vessels serving the skin and digestive viscera.

Explanation:

Cardiovascular effects of the sympathetic division include all of the following EXCEPT dilation of the blood vessels serving the skin and digestive viscera.

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2 years ago

Cattle on an open range, in some areas, may compact fragile soils while grazing. This can damage plant roots, leading to fewer,

sp2606 [1]

Answer:

The given situation is an example of the Positive feedback loop.

Explanation:

Positive feedback is the phenomenon in which the effects of the small disturbances on a particular system can result in an increase in the perturbation magnitude. Positive feedback increases the input and causes instability in the system. Therefore, it refers to positive loop gain about closed loop of the cause and effect.

Therefore, the given situation is an example of the Positive feedback loop.

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3 years ago

Write a conclusion based on why online delivery is beneficial (2-3 sentences long).

ryzh [129]

Answer:

For one, ordering online or through an app frees up staff while increasing order accuracy. It also trims the queue of customers waiting to order and even offers restaurants a means to track their guests' orders and habits.

Explanation:

(hope this helps)

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3 years ago

What is the term for when all the organisms are in a particular area

igor_vitrenko [27]

Population is the term used for the organisms

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3 years ago

The heart is a cone-shaped muscular organ located within the ________ of the thorax. its apex rests on the ___________ and its s

Arte-miy333 [17]

The heart is a cone-shaped muscular organ located within the mediastinum of the thorax.

The mediastinum is the space lined with membranous tissue between the lungs. The mediastinum contains not only the heart but also the great vessels (pulmonary artery, aorta, pulmonary veins, and the superior and inferior vena cava), as well as parts of the esophagus and the trachea.

Its apex rests on the diaphragm and its superior margin lies at the level of the 2nd rib.

The apex of the heart is the conical area created by the confluence of the ventricles, but mainly by the left ventricle. It rests on the diaphragm. The superior margin of the heart, also known as the base, lies at the level of the second rib.

Approximately two-thirds of the heart mass is seen to the left of the midsternal border.

This is because to the left of the midsternal border lies the left ventricle which comprises most of the heart mass as the left ventricle is the one responsible for pumping blood throughout the systemic circulation and significant pressure should be overcame; resulting to the physiologic hypertrophy of the left ventricle.

The heart is enclosed in a serosal sac called the pericardium. The loosely fitting double outer layer consists of the outermost fibrous pericardium, lined by the parietal layer of the serous pericardium.

The pericardium is one of three layers of the heart (other ones being the myocardium and the endocardium); and is the outer layer of the heart. The pericardium is composed of two tissues, the fibrous pericardium and the serous pericardium. The pericardium functions to lubricate the movement of the heart by the action of the pericardial fluid.

The heart has four chambers. Relative to the roles of these chambers, the atria are the receiving chambers, whereas the ventricles are the discharging chambers.

The four chambers of the heart are namely the right atrium, right ventricle, left atrium, and the left ventricle. Venous blood goes to the right atrium via the vena cavas then to the right ventricle via the tricuspid valve; then to the pulmonary circulation via the pulmonary artery where it will be oxygenated. From the pulmonary circulation, the left atrium will receive the oxygenated blood via the pulmonary veins then to the left ventricle via the mitral valve where it will be pumped to the systemic circulation via the aorta.

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3 years ago