QUESTION 41 How long after implantation is the placenta well established and ope

Question

QUESTION 41 How long after implantation is the placenta well established and operational (albeit not fully developed)? O 5 weeks O 2 weeks 8 weeks O 12 weeks QUESTION 42 Polycythemia is characterized by an excess of circulating: O immune cells O red blood cells 0 white blood cells O plasma proteins QUESTION 43 Where are the heart cells with the fastest rate of action potential initiation localized? O SA node O AV node O Bundle of His O Purkinje fibers QUESTION 44 Where is cellular metabolism carried out within cells? 0 mitochondria ? ribosome O nucleus

Explanation / Answer

41. 5 weeks

The placenta develops from the trophoblast and endometrium. The placenta becomes well established 5 weeks after implantation.

42. Red blood cells

Polycythemia is a condition characterised by increased levels of circulating hematocrit (volume percentage of RBC in the blood). This can be due to increased number of red blood cells or decrease in volume of plasma.

43. SA node

SA node initiate action potential and the action potential travels through the heart tissue and excite it.

44. Mitochondria

Mitochondria play a central role in cellular metabolism, which controle cellular energetics and cell death signaling

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