BIO310H5 Lecture Notes - Lecture 13: Diastole, Cardiac Muscle, Chelicerata
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Most invertebrates have open circulatory systems blood pumped from the heart to blood vessels empty into hemocoel (20%- Major difference between the pulmonary and systemic circuit is the blood pressure systemic system has higher blood pressure. Why the difference in blood pressure? the blood, through the systemic circulatio(cid:374), has to pass through the e(cid:374)tire (cid:271)od(cid:455) (cid:894)that"s (cid:449)h(cid:455) it has to lea(cid:448)e with higher pressure (the pulmonary system only has to travel shorter distances). The further you go from the heart, the lower the blood pressure gets. In the pulmonary system. all you (cid:374)eed is gas e(cid:454)(cid:272)ha(cid:374)ge (cid:894)(cid:455)ou do(cid:374)"t (cid:374)eed (cid:373)u(cid:272)h pressure for this(cid:895). Too much pressure results i(cid:374) filtratio(cid:374), a(cid:374)d (cid:455)ou do(cid:374)"t (cid:374)eed filtratio(cid:374) i(cid:374) the lu(cid:374)gs (cid:894)this is the (cid:272)ause of pul(cid:373)o(cid:374)ar(cid:455) hypertension). The heart cardiac muscles are striated muscles (actin and myosin filaments) cardiac muscle tissue is different from skeletal muscle interconnected and look like a mesh that surrounds the entire heart structure.
