Which is not true of skeletal muscle?
a. It enables you to manipulate your enviroment.
b. It influences the body's contours and shape.
c. It is one of the major components of hollow
d. It provides a means f locomotion.
c. It is one of the major components of hollow organs.
Because the cells of skeletal muscle are relatively large and clindrical in shape, they are also known as__________.
Skeletal muscle cells have more than one nucleus.
The two contractile proteins that make up the myofilaments of skeletal muscle are _______and ______.
myosin and actin
Each muscle cell is surrounded by thin connective tissue called the
A strong cordlike structure that connects a muscle to another muscle or bone is
The junction between a nerve fiber and a muscle cell is called a _______.
The neuron and muscle fiber membranes do not actally touch but are seperated by a fluid-filled gap.
Humans have how many muscles and make up 40% of the body weight.
What are the functions of muscle tissue?
posture and body position
heat generation and protection
What are the special characeritics of muscles?
Smooth muscle tissue
is found in the walls of hllow visceral organs such as the stomach, urniary bladder, and respiratory passages.
is a motor neuron and all the muscles it supplies
What is muscle twitch?
is a rapid contraction that is triggered by a single action potential.
Sometimes, we experience muscle twitches around our eyes.
skeletal muscle s always slightly contracted due to spinal reflexed. It does not produce ative movement. Essential to keep muscles firm, healthy, ready to respond, stablize posture and joints.
In muscle metabolism, muscle fibers can make ATP via three mechanisms:
1. aerobic respiration- requieres O2--slow, but makes the most ATP per molecule of glucose.
2.creatine kinase- does not requiere O2--transfers a phosphate from cretine phosphate to ADP to make ATP.
3. lactic acid fermentation- does not require O2--couples a fermentation step with glycolyis; glucose to latic ad-anerobic-faster than aerobic pathwy but only 5% efficient.
A prime mover or ___________ is responsible for producing a particular type of movement.
Skeletal muscles are named on the basis of many criteria. Name one?
direction of muscle fibers
Muscles of acial expression differ from most skeletal muscles because they insert into the skin or other muscles rather than into bone.
The _________ musculature includes muscles that move the vertebral colum and muscles that move the ribs.
Muscles that act on the _____ cause movement at the hip, knee, and foot joints.
This two-headed muscle bulges when the forearm is flexed. It is the most familiar muscle of the anterior humerus. It is the ____.
These abdominal muscles are responsible for giving me my "six pack". They also stabalize my pelvis when walking. They are the ________.
This lower limb muscle, which attaches the the knee is extended, is the _________.
The ________is the largest and most superficial of the gluteal muscles.
Another name for a muscle cell is muscle fiber?
Skeletal muscle is:
The functional unit of skeletal muscle is the
The thin filament of muscle cells is called
the thick filaments of muscle are
When the thick and thin filaments link together they form what are called crossbridges.
Myglobin has a special funtion in muscle tissues. It______________.
holds a reserve supply of oxygen in the muscle
In skeletal muscle which region or organelle contains the highest concentration of calcium ions in a resting muscle fiber?
sarcoplasmic reticulum (SR)
The theory of muscle contaction is called
sliding filament model