The SA node exhibits automaticity; it can spontaneously generate action potentials without neural input. 

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#Unit 10. Ecological Principles

In arid conditions, RWC values of less than 50% cause most plants to die

whereas values closer to 100% indicate plants are less affected by drought stress.

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#Unit 3. Fundamental Processes

A monocistronic eukaryotic message. The 5’cap is indicated by a “ball” at the end of the mRNA.

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#Unit 7. System Physiology – Animal

Rapid Ventricular Ejection

Blood is rapidly ejected from the left ventricle into the aorta through aortic valve, driven by the pressure gradient between the left ventricle and the aorta.

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#Unit 4. Cell Communication and Cell Signaling

Ras-GAP protein, 

NF1 (neurofibromatosis)

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#Unit 7. System Physiology – Animal

A spirogram indicating changes in lung volume under different conditions of breathing.