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The heart is enclosed in a membranous sac called the pericardium. It has two layers- the fibrous pericardium which is the outer layer and the serous pericardium that lies inside the fibrous pericardium. The serous pericardium has two layers - the outer parietal and the inner visceral layer. The parietal layer lines the fibrous pericardium and the visceral layer the surfaces of the heart. This visceral layer is also called the epicardium.
The pericardium is conical in shape, the base being directed downwards and is partly fused with the tendon of the diaphragm. The apex is the upper end and is fused with the great blood vessels.
What is circulation? Circulation is the movement of substances as nutrients and gases within blood vessels and cavities all by the organism.
Q. Is there a larval stage in echinoderms? In echinoderms embryonic development is indirect, with ciliated larvae.
A)Which of the following statements about DNA structure is true? 1.The nucleic acid strands in a DNA molecule are oriented ant parallel to each other, meaning they run in opposite
Animals of the littoral zone Animals of this zone may be herbivores, carnivores or detritus feeders and are as diverse as plants. Many of them such as rotifers, protozoans, i
PROVIDE a specific example for epithelial and connective tissues, how the arrangement of cells helps with tissue functioning?
Which of the following occur in response to an increase in the length of the right knee extensors in response to a quick tap applied to the right patellar tendon? An increase in t
The second maturation division of the mammalian ovum occurs: 1. Shortly after ovulation before the ovum makes entry into the Fallopian tube 2. Until after the ovum has been p
Nonsurgical retreatment will be the preferred choice -Less invasive .. not cause problem to the pt. -Less traumatic postoperative .. most probably no post operative pain
hey what is puperty
Hi, I have this presentation about the kingdom of fungi, and no website could clearly explain the two processes of fragmentation and sporulation. I mean what are their steps? And w
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