![]() ![]() Sent by other neurons and carrying those signals to the cell body.įIGURE 6.31 - Taken through a microscope, this photograph (right) shows a neuron ~0.01 cm from tip to tip. The dendrites, which act as microscopic antennae, picking up signals Network of thin extrusions on the other side of a neuron are collectively Of information, carrying signals away from the cell body. On one side of a neuron is the axon, which acts as a transmitter Resembling roots of trees ( Figure 6.31). Protein in the usual way, neurons also have numerous long and wiry extensions To the main cell body that contains the biological nucleus and manufactures Sizes and shapes, their bulk properties are nonetheless similar. Though neurons come in more than a thousand different Or a total of ~100 billion neurons in a typical cranium-roughly Ultimate example of the extent to which matter has evolved in the known Universe.īrain Structure and Function Brains are made of cells just likeĪny other part of the human body. Is Nature’s most tantalizing, talented, and versatile creation-the The most complex clumps of matter found anywhere thus far. Make us aware that we are now thinking about them: The human brain canĬontemplate and explore the human brain. Most amazing of all, these silent, unfelt activities inside our heads Inįact, every thought, feeling, or action begins in the brain. Is the paramount part, controls all mental and physical activity. The body’s nervous system, of which the brain Hearts to beat, our lungs to pump, and our hands to get ready to interact NerveĬells constantly interchange these signals in our heads, ordering our Which then reacts by sending, in turn, instructions to the muscles. By matching them against memory, we recognized clusters of lettersĭifferent sensory organs transmit signals that stimulate the brain, Our eyes along this printed line, quickly scanning the shapes of the Nerve cells pass messages back and forth within our brains. The brain is the central clearinghouse of all animated acts.Īs these words are first written and then read, matter within our skulls Organisms manifest thisĬomplexity best by means of one exquisite piece of matter-the brain. In doing so depends largely on their complexity. The extent to which beings are successful Seeing, smelling, touching, tasting-all organisms acquire and file Unlike nonliving matter, life can monitor impressions from, and respond One of the most remarkable aspects of life is its awareness of its surroundings. Cosmic Evolution - Epoch 6 - Biological Evolution
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