Explain how the bird and mammal myogenic hearts keep beating.
Explain how the bird and mammal myogenic hearts keep beating.
Homework Answers
In birds and mammals heart, contraction is initiated by a special modified heart muscle known as SA node. It is located in right atrium. The SA node has the inherent power of generating a wave of contraction and controlling the heart beat. Hence,it Is known as the pacemaker. Since the heart beatIs initiated by the SA node and impulse of contractions originates in the heart itself, it is called myogenic.
SA node continuously releases impulses and the heart contracts
through the conduction system.
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You find an ancient mammal frozen in a glacier. You suspect that it is a member of an extinct species of sloth. Contemporary sloths have a DNA G-C content of 66%. You are only able to determine the amount of Thymine from the frozen specimen (T = 17%). Is your frozen mammal a member of a different sloth species or the same as modern sloths? Explain.
Styles Styles Pane 2) a. Using the scientific literature, find the respiratory surface area for two non mammal and non bird species from different lineages of animals (a snake and fish for instance or insect and a octopus) (include the species name and body mass). b. Compute the body surface area and body volume of 10 g and 200 kg mammal using the equation SA 10 x body mass0 667 where SA is in cm2 and body mass is in...
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