Name the two phyla which exhibit the open circulatory system.
Asked by Topperlearning User | 18th Jul, 2014, 02:13: PM
Arthropoda and Mollusca
Answered by | 18th Jul, 2014, 04:13: PM
- What is open vascular system
- A: elevated levels of sodium Ion increase the heart rate and contact ility R: elevated sodium Ion level increase excitability of s a node
- A: The resting heart rate about 75 per minutes usually is lower than the autorhythmic rate of SA node (90 to 100 beats per minute) R: at resting condition the parasympathetic effects dominates
- Why do cardiac muscles never get tired?
- the right answer in option A but here it is showing option C
- what will happen if pacemaker is non functional a. only cardiac muscle will contract rhytically b. the cardiac muscle will not contract in a cordinated manner rhythmically c. cardiac muscle will contract rhythmically in a cordinated manner
- Name the germinal layer from which the heart is derived in humans.
- Name the protective covering of the heart.
- State the location of the mitral valve.
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