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Heterozygous means that the parents both carry a dominant allele (A) and a recessive allele (a).

Dominant alleles are always expressed in the phenotype. Recessive alleles are expressed in the pheno...

1. Action potential arrives at axon terminal of presynaptic neuron

2. Voltage-gated Ca2+ channel opens

...

This system is made up of two main components: the heart and the vasculature.  The heart is an organ with two sides, each of which is dedicated to carry out a different job.  The right side receives deoxy...

diffusion is the movement of particles from a high concentration to a low concentration through a semi permeable membrane. an example would be the movement of food molecules through the gut wall as they p...

The four chambers of the heart are the upper two atria (atrium for singular) and the lower two ventricles. The atria first receive the blood, which is then pumped to its destination via the ventricles. Th...