SA node has Prepotential or pacemaker potential which is the gradual potential rise from the resting membrane potential to threshold  ( -40 mV) & this occur spontaneously

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#Id: 5379

#Unit 10. Ecological Principles

Uniform: Competition may cause a uniform dispersion pattern between individuals. The pattern of trees and seedlings may appear random as seedlings develop from seeds dropped at random.

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#Id: 5380

#Unit 10. Ecological Principles

1. The dispersion pattern starts out random but ends up uniform.
2. Uniform dispersions may also result from social interactions.
3. Territoriality between animals also causes uniform dispersion patterns.

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#Id: 5381

#Unit 10. Ecological Principles

Random: The rarest dispersion pattern is random because resources in nature are rarely randomly spaced.

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#Id: 5382

#Unit 10. Ecological Principles

Perfect compensation hypothesis

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#Id: 5383

#Unit 10. Ecological Principles

Age-specific fertility rate - Any given age, Proportion of female offspring that are born to females of reproductive age.

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#Id: 5384

#Unit 10. Ecological Principles

Thermodynamic hypothesis