Muscular+System+KR

=Muscular System=

Keaton Rye
Muscular System (1) What are the three types of muscles in the human body? (Describe and include pictures) (2) List and discuss the functions of muscles. (3) Give an example that illustrates how muscles work in antagonistic pairs. (pictures good) (4) Describe the microscopic anatomy of muscle fiber and explain the sliding filament model of muscle contraction. (long answer) (5) Describe the structure and function of the neuromuscular junction. (6) Describe the events as myosin pulls actin toward the center of the sarcomere. (7) Contrast a muscle twitch with summation and tetanus. (8) What is muscle tone, and how is it maintained?


 * (1) What are the three types of muscles in the human body? (Describe and include pictures)**
 * smooth muscles**, **cardiac muscles**, and **skeletal muscles**.Smooth muscles are located in our organs. Cardiac muscles are for involuntary contractions like the lungs and heart exc.. Skeletal muscles are around our bones and sustain voluntary contractions.



They make the bones in our bodies to move, support our bodies, maintain a constant body temperature, and protect and stabilize internal joints.
 * (2) List and discuss the functions of muscles.**

When the Gastrocnemious contracts it makes the peroneus move.
 * (3) Give an example that illustrates how muscles work in antagonistic pairs. (pictures good)**


 * (4) Describe the microscopic anatomy of muscle fiber and explain the sliding filament model of muscle contraction. (long answer)**
 * 1) //**Sarcolemma**//: Plasma membrane of a muscle fiber.
 * 2) //**Sacroplasm**:// Cytoplasm of a muscle fiber that contains the organelles?
 * 3) //**Glycogen**:// stores and retains energy for the muscles
 * 4) //**Myoglobin**:// red, and stores oxygen..
 * 5) **//T-////tubule//**//:// is a tube that extends into various muscles
 * 6) //**Sarcoplasmic** **reticulum**//: stores C2+
 * 7) //**Myofibril**:// A bundle of myofilaments that contracts.
 * 8) //**Myofilament**//: accounts for muscle contrast

Muscle fibers are stimulated to contract by motor neurons whose axons are in nerves. The branch of an axon ends in an axon terminal. A small gap, called a synpatic cleft. The entire thing is called a **neuromuscular joint**.
 * (5) Describe the structure and function of the neuromuscular junction.**

Threads of tropomyosin wind about an actin filament, and troponin occurs at intervals along the threads. Then the Myosin can now bind to the actin.
 * (6) Describe the events as myosin pulls actin toward the center of the sarcomere.**

A //Muscle Twitch// is when a motor unit is stimulated by infrequent electrical impulses.
 * (7) Contrast a muscle twitch with summation and tetanus.**

//**Muscle tone** is// when some motor units are always contracted but not enough to cause movement.
 * (8) What is muscle tone, and how is it maintained?**