test 2 Flashcards
What name is given to unspecialized bone cells that undergo cell division?
osteogenic cells
____ are immovable joints, for example, fibrous joints of the skull
Synarthroses
According to the sliding filament model, binding sites on actin open when
calcium levels rise
Muscle that has a striped appearance is described as being___
striated
Arrange the following events of endochondral ossification in the proper sequence:
(1) Cartilage matrix is calcified and chondrocytes die.
(2) Chondrocyte hypertrophy.
(3) Cartilage model is formed.
(4) Osteoblasts deposit bone on the surface of the calcified cartilage of the primary ossification center.
(5) Blood vessels from the periosteum invade calcified cartilage bringing in osteoblasts and osteoclasts.
3,2,1,5,4
The covering of the outer surface of the bone is the?
periosteum
During muscle contraction, the cross-bridge detaches when__?
The myosin head binds to an ATP molecule
Which of the following is composed of myosin molecules?
Thick myofilaments
A ___ muscle typically has fascicles on both sides of the tendon
bipennate
Spongy bone tissue contain
interconnecting plates called trabeculae
Spongy bone tissue contains
interconnecting plates called trabeculae
_____ is the foot movement at the ankle when the heel is lifted off the ground
Plantarflexion
The outside of the resting plasma membrane is ____ relative to the inside of the resting plasma membrane
positively charged
Movement at the shoulder joint that moves the upper limb laterally away from the body is called____
abduction
The model that describes the contraction of the muscle is called the____
sliding filament model
Which of the following is TRUE regarding a pivot joint?
I.Uniaxial joint
II. Biaxial joint
III.Allows rotational movement
IV.Allows inversion / eversion
V. Allows medial / lateral rotation
1 and 3 are true
Which method during embryonic development is responsible for the formation of most bones
endochondral offifaction
The primary function of osteoblast
lay down bone matrix
_____ is the posterior motion of the scapula or mandible
retraction
Which type of bone cell has processes that lie in canaliculi
osteocyte
Which of the following statements about muscle tissue is true?
a.There is a small amount of smooth muscle in the heart
b.Cardiac muscle cells have multiple nuclei
c.Smooth muscle cells are long and cylindrical
d.Smooth muscle is found in the walls of hollow organs
Smooth muscle is found in the walls of hollow organs
____ refers to a muscle with the opposite action of the prime mover
antagonist
The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called ________________________
neruomuscular junctions
The _____ fracture which only one side of the bone is broken
greenstick
