Answer:
Humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes, called autosomes, and one pair of sex chromosomes, X and Y. Each parent contributes one chromosome to each pair so that offspring get half of their chromosomes from their
Answer:
The correct answer is: As ventricular systole start, the AV valves are closed and the semilunar valves are closed. Because the ventricles are contracting and both valves are closed, pressure increases rapidly leading to ejection.
Explanation:
The heart functions like a bomb that pumps blood to every part of the body, which is fundamental for the proper function of every organ.
The cardiac cycle has two main phases: the diastole and the systole. During the diastole, blood returns from the body through the vena cava and is deposited in the right atrium of the heart. When the pressure in the right atrium becomes bigger than the pressure in the right ventricle, the tricuspid valve opens and the blood flows to the left atrium.
During systole, the atria suffer a depolarization that makes the atria's muscle contract. Thanks to this, the blood goes through the atria to the ventricles.
During isovolumetric contraction, the ventricles contract but the pulmonary and aortic valves remain closed. When the ventricular muscle contracts, the semilunar valves open.
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Answer: Option E.
All of the above.
Explanation:
Streptococci pyogenes is a disease caused by streptococci bacteria. These bacteria are gram positive ,non sporeforming and non motile.
The virulence factors are substance produced by bacteria to ensure their effective attack.
The virulence factors of S. Pyogenes are;
Spiky M proteins and lipoteichoic acids which they use as attachment to host organisms.
Hyaluronic capsule which the use to slow or inhibit phagocytosis.
Polysaccharide cell wall which causes the rash of scarlet fever.
The right answer is to take the medication during a meal.
The therapeutic properties of non-selective NSAIDs are based on the inhibition of cyclooxygenases (COX 1 and 2) which are enzymes that convert arachidonic acid into prostaglandins.
Inhibition of the synthesis of gastroduodenal prostaglandins alters the defense mechanisms of the mucosa and thus promotes the occurrence of ulcers, usually gastric and duodenal.
Inhibition of prostaglandins will initially result in a decrease in mucosal blood flow. Polynuclear adhesion to the wall then results, leading to endothelial lesions and accentuating the decrease of the mucosal blood flow, thus favoring the inflammatory process in the digestive mucosa.
The inflammation is amplified by the production of TNF-Alpha stimulated by anti-inflammatory drugs in macrophages.