动物生理学肌肉的收缩.ppt

动物生理学肌肉的收缩
肌肉组织的生理功能
移动身体
保持姿势
呼吸
机体产热
通信
缩窄器官和血管
心脏跳动
肌肉组织的特性
收缩性Contractility
Ability of a muscle to shorten with force
兴奋性Excitability
Capacity of muscle to respond to a stimulus
伸展性Extensibility
Muscle can be stretched to its normal resting length and beyond to a limited degree
弹性Elasticity
Ability of muscle to recoil to original resting length after stretched
肌肉组织的分类
骨骼肌Skeletal
Attached to bones
Nuclei multiple and peripherally located
Striated, Voluntary and involuntary (reflexes)
平滑肌Smooth
Walls of hollow organs, blood vessels, eye, glands, skin
Single nucleus centrally located
Not striated, involuntary, gap junctions in visceral smooth
心肌Cardiac
Heart
Single nucleus centrally located
Striations, involuntary, intercalated disks
骨骼肌的结构 I:
骨骼肌的结构 II:
骨骼肌的结构 III:
肌纤维:
肌膜
肌质
肌元纤维
内部结构:
肌原纤维
细肌丝
粗肌丝
肌质网
T管
终池
肌质
肌膜
三联体
横 纹:
肌联蛋白
细肌丝
粗肌丝