the Galapagos
While visiting the Galapagos in 1835, British naturalist Charles Darwin observed local plants and animals.
Tissue damage activates nociceptors or pain receptors in the skin. A signal is sent to the peripheral nerve to the spinal cord where neurotransmitters or chemical messengers are released. It activates other nerves to pass signal to the brain. The signals are relayed to the somatosensory cortex for sensation, frontal cortex for thinking and limbic system for emotional response.
Heart,vessels,circulating fluids
Enclosed within the nucleolus of the cell.
