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vitfil [10]
3 years ago
13

Part of the tooth covered with enamel.

Medicine
2 answers:
Strike441 [17]3 years ago
8 0

Answer:

The answer to the question: The part of the tooth that is covered with enamel, would be: the crown of the tooth.

Explanation:

The human teeth are divided into two parts, a hardened one, which is the one we can see protruding from the gum line, and which is the one that we use to bite, pounce food and chew it before swallowing. This portion of the tooth is called the crown, it is the white, hardened, visible part, and it is covered with enamel to protect it from the mechanical and corrosive forces of both food, and saliva, as well as bacteria. The second portion of the tooth is known as the root, and it is the softer part that is protected and covered by the gums. The root anchors the tooth to the bone structures of the mandible and maxilla.

Lina20 [59]3 years ago
8 0

Answer:

The crown is the part of the tooth that is covered by enamel.

Explanation:

In the constitution of the tooth four distinct areas can be visualized: the enamel, the dentine, the cement and the pulp. The tooth has a part that comes out of the gums and another that is inside them. The visible outer part of the tooth that is covered by the enamel is called the crown. If it is broken or deteriorated for any reason, it does not have the possibility of self-reconstruction, so the dentist's intervention becomes essential.

Enamel coats the crown of the tooth and is quite hard, as it is the most mineralized tissue found anywhere in the human body. About 96% of its composition is mineralized material, while the remaining 4% is composed of water and organic materials. The thickness of the enamel, in turn, varies from the tip of the crown to the amelio-cementary junction. In the crown, the thickness is greater and decreases as you approach the gum.

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Be able to describe the cardiac cycle using the appropriate chambers, valves, and vessels. What are the stages of the cardiac cy
Natasha_Volkova [10]

Answer:

The heart beat sequence is the sequence of events that occurs when the heart beats. As the heart beats, blood circulates through the pulmonary and systemic circuits of the body. There are two stages of the heart beat cycle: the diastole phase and the systole phase. In the diastole phase, the ventricles of the heart relax and the heart fills with blood. In the systole phase, the ventricles contract and pump blood from the heart to the arteries. A cardiac cycle is completed when the chambers of the heart fill with blood and blood from the heart is pumped.

Explanation:

1. Ventricular Diastole

For the period of ventricular diastole, the atria and ventricles of the heart are relaxed and the atrioventricular valves are open. The oxygen-free blood that returns to the heart from the body after the last cardiac cycle passes through the superior and inferior cava veins and flows into the right atrium.

Open atrioventricular valves (tricuspid and mitral) allow blood to pass through the atria into the ventricles. The impulses of the sinoatrial node (SA) travel to the atrioventricular node (AV) and the AV node sends a signal that triggers the contraction of both atria. As per a result of this reduction, the right atrium empties its contents into the right ventricle. The tricuspid valve, located between the right atrium and the right ventricle, prevents blood from flowing into the right atrium.

2. Ventricular Systole

At the beginning of the ventricular systole period, the right ventricle, which is full of blood that passes from the right atrium, receives impulses from the fiber branches (Purkinje fibers) that carry electrical impulses that cause it to contract. When this occurs, the atrioventricular valves close and the semilunar valves (pulmonary and aortic valves) open.

Ventricular contraction causes oxygen depleted blood from the right ventricle to be pumped into the pulmonary artery. The pulmonary valve prevents blood from returning to the right ventricle. The pulmonary artery carries deoxygenated blood along the pulmonary circuit to the lungs. Here, the plasma gathers oxygen and returns to the left atrium of the heart through the pulmonary veins.

3. Atrial Diastole

In the period of atrial diastole, semilunar valves close and atrioventricular valves open. Oxygenated blood from the pulmonary veins fills the left atrium, while blood from the vena cava fills the right atrium. The SA node contracts again, causing both atria to do the same.

in the next step of process, atrial contraction causes the left atrium to empty its contents into the left ventricle and the right atrium to empty its contents into the right ventricle. The mitral valve, located between the left atrium and the left ventricle, prevents oxygenated blood from returning to the left atrium.

4. Atrial Systole

During the period of atrial systole, the atrioventricular valves close and the semilunar valves open. The ventricles receive impulses to contract. Oxygenated blood in the left ventricle is pumped into the aorta and the aortic valve prevents oxygenated blood from returning to the left ventricle. The oxygen-depleted blood is also pumped from the right ventricle to the pulmonary artery at this time.

The aorta branches to provide oxygenated blood to all parts of the body through systemic circulation. After its journey through the body, deoxygenated blood returns to the heart through the vena cava.

4 0
3 years ago
Standardized 1RM testing is contraindicated for children under 12 years of age.
Nimfa-mama [501]

Answer: b. False

Explanation:

The one repetition maximum or (1RM) test is a test which is used to measure the strength capacity of the individuals typically in a non-laboratory environment. It is define as the maximum weight that an individual can lift only with one repetition and with the use of the correct technique. This is basically done to check the strength capacities, strength imbalances and also to evaluate the effectiveness of a particular training programmes.  

It can be tested on large varieties of populations that actually range from children aged 6 years and more, middle aged patients those are suffering from coronary heart disease.

8 0
3 years ago
Who identified a Patient Bill of Rights? ​
almond37 [142]
It was the american hospital association. It was discovered in the early 1970’s
7 0
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What does germs have to do with the integumentary system if you do good i give brainliestPLZZZZZZZ:)
andriy [413]

Answer:

The integumentary system is susceptible to a variety of diseases, disorders, and injuries. These range from annoying but relatively benign bacterial or fungal infections that are categorized as disorders, to skin cancer and severe burns, which can be fatal. In this section, you will learn several of the most common skin conditions.

Explanation:

8 0
3 years ago
The absorption of usable nutrients occurs in the _________.
Monica [59]

Answer:

Small intestine

Explanation:

Around eighty percent of usable nutrients are absorbed in the small intestine.

The main area of gastrointestinal tract responsible for absorption is small intestine. It consists of three sections, i.e. the duodenum, jejunum and ileum. In duodenum, jejunum  majority of nutrients are absorbed.

The duodenum absorbs carbohydrates, proteins, and starches that are in the form of glucose or proteins are absorbed in the jejunum.

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