ZOO 2090 Lecture Notes - Lecture 16: Pericardium, Fish Scale, Acrodont
23 Nov 2016
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Day 16: response to special needs of organs. Hearts located far forwards slender body and tight skin. Body muscles squeeze venous blood back to the heart vascular tissue of lung near the heart/ short vascular lung. [gravity definitely less of a problem for them] tall animals also have similar mechanisms thermoregulation: keep blood to brain not too hot, not too cold: nasal rete reduce heat loss from limbs vascular countercurrent exchanger: rete. Diversity in digestive system the space between the splanchnic layer and somatic layer (splanchno-coel) develops into the coelom. Digestive system receive, store, break down (physically and chemically), and absorb food store and discharge undigested waste vertebrates have a complete digestive tract from mouth to anus (or cloaca) component overview. Esophagus stomach intestine (small and large) cloaca or rectum. Accessory organs and glands tongue, teeth salivary glands, pancreas, liver. Ancestral vertebrates were likely filter feeders with small mouths. Derived from body dermal armor/similar structure to placoid scales.
