The \"lubb\" heart sound is caused by: the semilunar valves closing the atrioven

Question

The "lubb" heart sound is caused by: the semilunar valves closing the atrioventricular valves closing the semilunar valves opening the atrioventricular opening Choose the correct sequence for the spread of the cardiac impulse (action potential)? AV node rightarrow AV bundle rightarrow SA node rightarrow Heart muscle AV bundle rightarrow AV node rightarrow SA node rightarrow Heart muscle AV node rightarrow AV node rightarrow AV bundle rightarrow Heart muscle A node rightarrow AV bundle rightarrow AV node rightarrow Heart muscle Erythrocytes are produced in the bone marrow when the hematopoietic stem cells are exposed to hormone One of the conditions that stimulates this to occur is when the body is exposed thropoietin (EPO): hypoxia b) erythrostimulin: hyperoxia throus colony stimulating factor: hypertension c) erythogemtin, hypotension The ___ portion of the human body includes the upper and lower limbs (arms and legs) and portion includes the head, neck and trunk. al: circumferential b) appendicular: axial appendicular d) circumferential: apical The subcutaneous layer of the integument organ also known as the bypodenms contia erable amount of which type of tissue or cell? drocytes b) adipose tissue c) reticular connective tissue d) glial cells The organelle that contains powerful enzymes that break down proteins, carbohydrates, acids and even foreign particles and bacteria is known as the ome b) catabolosome c) desmosome d) digestosome The cavity is subdivided by the diaphragm into the thoracic cavity and the cavity. The abdominopelvic cavity can be further subdivided into 9 sections -portion of this cavity (which would be superior to the umbilical region) is called cavity: pubic b) peritoneal cavity: hypochondriac cavity: hyposaccral. d) ventral cavity: epigastric

Explanation / Answer

19. The answer is atrioventricular valve closing.

(Reason : The the first heart sound lubb or S1 is produced by the closing of the atrioventricular valves and the second heart sound dubb or S2 is produced by the closure of semilunar valves.)

20. The correct sequence is SA node - > AV node - > AV bundle - > Heart muscle.

The electrical impulse system of the heart genetate signals or cardiac impulse usually by the sinoatrial node or SA node travels through the right atrium to the atrioventricular node or AV node along the Bundle of His and through bundle branches ( collectively called AV Bundle) to of the heart muscle to stimulates the contraction of heart muscles, first of the right and left atrium, and then the right and left ventricles.

21. The correct answer is option (a)

(reason : Erythropoiesis is the process of production of red blood cells (erythrocytes). It is stimulated by decreased O2 in circulation or hypoxia and the phenomena is detected by the kidneys, which then secrete the hormone erythropoietin, which stimulates proliferation and differentiation of erythrocyte precursors, which activates increased erythropoiesis in the hemopoietic tissues to produce more RBCsto combat the situation.

22. The correct option is (b)

(reason : The appendicular portion of the human body includes the upper and lower limbs, while the axial portion includes head neck and trunk.)

23. The correct answer is (b)

(reason : Adipose tissues is theloose connective tissue composed of adipocyte cells storing fats, it is present in various parts of the body, predominantly under the epidermis and around visceral organs)

24. The correct answer is lysosomes

(reason : A lysosome is a membrane-bound organelle found in eukaryotic cells containing hydrolytic, proteolytic, lipolytic enzymes and other reactive ion and grroups and is involved in various cabolic and catalytic cell processes)

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