BI13_Ch9 PP Outline

BI13_Ch9 PP Outline - 1 2 Muscles and Muscle Tissue Chapter...

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1 Muscles and Muscle Tissue Chapter 9 2 Goals Know the types and functions of muscles Describe muscle anatomy Gross and microscopic Understand muscle cell physiology How muscles contract How contraction is stimulated Know 3 ways for muscles to make ATP Describe similarities and di f erences between the 3 types of muscle Fbers 3 Introduction Muscle ±unctions Muscle Types 4 Muscles Produce Movement Muscles are attached to bones Contraction of muscles across joints produces movement Also stabilizes posture 5 Muscles Stabilize Joints Bone and ligaments alone cannot support joints Muscle tonus is critical for maintaining joint stability Chapter 8 6 Muscles Generate Heat Contraction generates heat 40% body mass is skeletal muscle Shivering increases body temp 7 Muscles Protect Underlying Organs Encloses and cushions viscera ±orms valves that regulate the passage of substances in and out of body 8 Introduction Muscle ±unctions Muscle Types Smooth Cardiac Skeletal 9 Smooth Muscle Location Walls of hollow organs Stomach and bladder Arranged as two overlapping sheets Longitudinal layer Opens and fatten Circular layer Closes and elongates
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Closes and elongates Peristalsis Layers alternate contractions Pushes organ contents through 10 Smooth Muscle Morphology Oval Uninucleate Not striated Caveolae PM indentations that hold extracellular Ca2+ Connected by gap junctions Contract as a group Don’t need a neuron for every cell 11 Smooth Muscle Contractions Involuntary Control Autonomic nervous system Hormones Like oxytocin released during labor Stretch Slow and sustained contractions 30x more slower than skeletal muscle Produce the same force for 1% the energy cost 12 Introduction Muscle Functions Muscle Types Smooth Cardiac Skeletal 13 Location and Morphology Found only in the heart Striated muscle Uni and binucleate branched cells Intercalated disks Where cells are connected by desmosomes and gap junctions 14 Cardiac Muscle Contractions Not under voluntary control Controlled by pacemaker cells Automatically initiate contraction without nervous system input Nervous input can a f ect the rate and strength of contraction 15 Introduction Muscle Functions Muscle Types Cardiac
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Smooth Cardiac Skeletal 16 Location and Morphology Attached to bones These are the largest muscle cells A single long cell is called a fber Cells are multinucleate Striated muscle 17 Skeletal Muscle Contractions Under voluntary control Contracts only in response to nervous input Uses a huge amount oF energy Exert a wide range oF Forces Gentile to hard Strong but tire rapidly 18 Practice Test Questions Which oF the Following is not a Function oF the muscles? Movement Support Generate heat Store calcium True or False? Cardiac muscle is a type oF smooth muscle.
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BI13_Ch9 PP Outline - 1 2 Muscles and Muscle Tissue Chapter...

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