BIOL 103 Lecture 4: Week 4 Module 4

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All animals except sponges have neuron and muscle cells. Nerve net: diffuse arrangement of cells, found in cnidarians and ctenophores. Central nervous system (cns): includes large numbers neurons aggregated into ganglia clusters. Most animals have brain located in anterior end (cephalization: symmetric body with info and processing structures at head end) Cephalization: made animals efficient eating and moving. Sensory appendages intake info, send it to brain to process, integrate info, send electrical signals back out to muscles / other tissues to respond to stimulus. Muscles: respond to electrical signals by contracting. Sensory receptors in skin, eyes, ears, nose stream data about external environment. Sensory cells internally monitor conditions of homeostasis. Sensory neuron: sensory receptor cell transmits information it receives by this nerve cell. In (cid:448)erte(cid:271)rate"s se(cid:374)sor(cid:455) (cid:374)euro(cid:374) se(cid:374)d i(cid:374)fo to (cid:374)euro(cid:374)s i(cid:374) (cid:271)rai(cid:374) or spi(cid:374)al (cid:272)ord (cid:271)(cid:455) (cid:374)er(cid:448)es. Have thousands projections from neurons, carry info to and from brain and spinal cord.

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