Types of Movements
For a ballet dancer to stand on her toes, her feet must _________
plantar flex
Which type of joint is the most movable?
Synovial
Which of these is not a major property of muscle?
a. contractility
b. elasticity
c. excitability
d. extensibility
e. secretability
e. secretability
Skeletal muscle fibers contain only one nucleus in the center.
False
Which of these joints has a tendon inside the joint cavity?
A) temporomandibular joint
B) shoulder joint
C) elbow joint
D) knee joint
E) ankle joint
B) shoulder joint
What type of movement is the first image showing?
Protraction
Joints containing hyaline cartilage are called _________
Synchondroses
What are the four major functional properties of muscle tissue?
1.contractility
2. excitability
3. extensibility
4. elasticity
Which of these is true of skeletal muscle?
a. spindle-shaped cells
b. under involuntary control
c. many peripherally located nuclei per muscle fiber
d. forms the walls of hollow internal organs
e. may be autorhythmic
c. many peripherally located nuclei per muscle fiber
Relaxation in smooth muscle occurs when
a. myosin kinase attaches phosphate to the myosin head
b. Ca2+ bind to calmodulin
c. myosin phosphatase removes phosphate from myosin
d. Ca2+ channels open
e. Ca2+ are released from the sarcoplasmic reticulum
c. myosin phosphatase removes phosphate from myosin
What type of movement is this?
Lateral excursion to the left
Joints are classified according to the _______________
structure of the joint
What are the three types of muscle tissue?
1. skeletal
2. smooth
3. cardiac
What is the function of the smooth muscle?
Moving food through the digestive tract, emptying the urinary bladder, regulating blood vessel diameter, changing pupil size, contracting many gland ducts, moving hair, and having many other functions.
Which of these does not occur with the aging of joints?
A) decrease in production of new cartilage matrix
B) decline in synovial fluid production
C) ligaments and tendons stretch and increase range of motion
D) weakening of muscles
E) increase in protein cross-linking in tissues
C) ligaments and tendons stretch and increase range of motion
What type of movement is this?
Circumduction
Which of the following types of joints holds two bones tightly together with a ligament?
Syndesmoses
What are the 7 functions of the muscular system?
1. Movement, 2. Posture, 3. Respiration, 4. Heat, 5. Communication, 6. Constriction of organs and vessels, 7. Contraction of heart
Which of these statements concerning aging and skeletal muscle is correct?
a. A loss of muscle fibers occurs with aging
b. slow-twitch fibers decrease in number faster than fast-twitch fibers
c. the loss of strength and speed is due mainly to loss of neuromuscular junctions
d. the density of capillaries in skeletal muscle increases
e. the number of motor neurons remains constant
a. A loss of muscle fibers occurs with aging
A weight lifter attempts to lift a weight from the floor, but the weight is to heavy that he is unable to move it. The type of muscle contraction the weight lifter is using is mostly
a. isometric
b. isotonic
c. isokinetic
d. concentric
e. eccentric
a. isometric
What type of movement is the second image showing?
Lateral rotation
The inability to produce the fluid that keeps most joints moist would likely be caused by a disorder of the _________
synovial membrane
Which of these conditions would you expect to find within the leg muscle fibers of a world-class marathon runner?
a. myoglobin-poor
b. contract very quickly
c. primarily anaerobic
d. numerous mitochondria
d. numerous mitochondria
Compared with skeletal muscle, visceral smooth muscle
a. has the same ability to be stretched
b. loses the ability to contract forcefully when stretched
c. maintains about the same tension, even when stretched
d. cannot maintain long, steady contractions
e. can accumulate a substantial oxygen deficit
c. maintains about the same tension, even when stretched
What are the different types of joints?
fibrous joints, cartilaginous joints, and synovial joints.