The muscle tissues in the human body contain three muscle types: Skeletal, Smooth, and Cardiac. They are similar since they all have nuclei, but they differ in structure, function, and control. While they all contain mitochondria for their energy, the skeletal muscles have the highest amount of mitochondria, while the smooth muscles have the fewest amount making the cardiac muscles intermediate. Although they are all elongated, the skeletal muscles have a cylinder shape, the smooth muscle is spindle-shaped, and the cardiac muscle type is shaped like a branch. All muscle types play a unique role in supporting the body such as voluntary movements and involuntary actions.
The neuron structure is similar to a tree's structure. To start, the roots of a tree absorb nutrients like how dendrites receive signals from other neurons. The axon carries signals away from the soma, similar to how the trunk supports the tree and transports nutrients. The bark protects the tree and the myelin sheath insulates the neuron. The branches of a tree are like the axon terminal since they spread out, just as axon terminals reach out to communicate.