Blood flow
The necessity of the normal pattern of blood flow through the heart is graphically illustrated in a pathology known as Transposition of the Great Vessels (TGV). About 4/10,000 infants are born with the congenital heart defect TGV. In this disorder, the origin of the aorta and the pulmonary trunk are switched, however the destinations of these vessels are normal. You may have to do some online research to find a diagram and a description in order to understand this pathology.
1. Select each answer choice that describes the NORMAL sequence of structures through which blood flows, starting with vena cavae. Note that not all structures are listed and that more than one answer may be correct.

a. Bicuspid → right ventricle → aortic valve → pulmonary circulation
b. Right atrium → semilunar valve right ventricle → AV valve → systemic circulation
c. Left atrium → bicuspid → left ventricle → AV valve → systemic circulation
d. Tricuspid → right ventricle → pulmonary valve → pulmonary circulation

D. Tricuspid → right ventricle → pulmonary valve → pulmonary circulation

Explanation:

The circulatory system is the system of organs and blood vessels which is associated with the circulation of the blood in the body.

The circulatory system is divided into two portions: the systemic circulatory system (body) and the pulmonary circulatory system (lungs).

The vena cava brings the oxygen-poor blood from the body to the right atrium from where the blood is transferred to the same side of the ventricle controlled by the tricuspid valve (atrioventricular valve).

From the right ventricle, the blood is pumped to the pulmonary artery which transports the blood to the lungs where the oxygen will be exchanged.

Thus, Option-D is correct.

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lasagna

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math

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.