PNB 2250 Lecture Notes - Lecture 27: Meiosis, Atp Hydrolysis, Cardiac Muscle
4 Nov 2016
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No need to waste energy to move: non-sessile animals. Must have the ability to control movement via neurons. Muscle: tissue which can convert chemical energy into mechanical movement, requires molecular motors, possesses the contractile machinery to cause movement. Cardiac muscle: consumption of atp= movement. Is controlled and regulated by the nervous system. No mucles: ctenophora (comb jellies, sea acorns) Neurons and striated muscle: cnidarian (jellyfish) Neurons and sense of organs: vertebrates and invertebrates. All three types of muscle: muscle appeared ~700 mya. Smooth muscle evolved independently from striated and skeletal muscle: properties. Dependent on the action of molecular motors. Get from point a to point b. Avoid predation, finding food, mates, etc: food through intestine. Allows for larger animal size: all require the use of energy (atp) to generate mechanical forces, movement of proteins to generate tension. Molecular motors: formation of bonds between proteins that cause parts of the protein to move.
