All multi-celled animal life forms are composed of various combinations of these four tissues. To learn more detail about the study of tissues, click here .
Neurons are the cells adapted for receiving and eliciting electrical signals.
Signals are sent to other neurons, glands, and muscle cells. Click here to learn more about nervous tissue . Muscle Tissue is specialized for cellular contraction, and hence movement of the organism or parts of the organism. The photo on the right shows several muscle cells of the heart. Muscle cells tend to be elongated and red in appearance.