A&P Lecture Exam #3
In the classification of joints, which of the following is true?
All synovial joints are freely movable.
Which of the following can be considered a function of the paranasal sinuses?
Sinuses take away a minimal amount of strength from bones while reducing the weight of bones.
What is the role of tropomyosin in skeletal muscles?
Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
During muscle contraction, myosin cross bridges attach to:
actin filaments
Articulations permitting only slight degrees of movement are ________.
amphiarthroses
Synarthrotic joints ________.
are immovable joints
Which vertebra does NOT have a body?
atlas
Connective tissue sacs lined with synovial membrane that act as cushions in places where friction develops are called ________.
bursae
Synchondroses and symphyses are examples of ________ joints.
cartilaginous
Which of the following statements defines synchondroses? Group of answer choices
cartilaginous joint such as the growth plate
Which of the following surrounds an individual muscle cell?
endomysium
cranial and facial bones
framework of face, special sence organs, anchor muscles for facial expression, provides passage for food and air for person.
Curvatures of the spine serve the body by ________.
giving additional springiness and flexibility to the spine which absorbs shock
What is the functional role of the T tubules?
hold cross bridges in place in a resting muscle
Bending your head back until it hurts is an example of ________. Group of answer choices
hyperextension
Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the ________ period during which the neurotransmitter is released by exocytosis, diffuses across the synaptic cleft, and binds to its receptors. Group of answer choices
latent
Origin
least movable end of a muscle
sutures
most skull bones are flat bones joined byinterlocking joints
The oxygen-binding protein found in muscle cells is ________.
myoglobin
Which of the following is the b est sequence of events for muscle contractions? (some events may be missing iin the sequence) Group of answer choices
neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
mandible
only movable bone of the skull
Which is the best description for the function of the cranial bones?
protect the brain
Articular cartilage found at the ends of the long bones serves to ________.
provide a smooth surface at the ends of synovial joints
What structure in skeletal muscle cells functions in calcium storage?
sarcoplasmic reticulum
Sarcomeres are functional units of ________ muscle.
skeletal, cardiac
The sella turcica is part of the ________ bone and houses the ________ gland.
sphenoid; pituitary
Myoglobin ________.
stores oxygen in muscle cells
Fibrous joints can be classified as ________.
sutures, syndesmoses, and gomphoses
The flat bones of the skull are connected to each other by immovable joints called _________.
sutures.
Two bones are connected exclusively by ligaments, cords, or bands of fibrous tissue is a ________.
syndesmosis
The glenohumeral joint that articulates the humerus to the pectoral girdle is a highly mobile joint. This mobility comes at a cost because ________.
the joint is relatively unstable and can easily dislocate
Insertion
the more movable end of a muscle
The axial skeleton includes ________.
the skull, vertebral column, and rib cage
The sphenoid bone is sometimes referred to as a "key stone" of the skull. This is due to the fact that ________.
the sphenoid is in the center of the skull and it articulates (joins) with all of the other bones of the skull
Which of the bones of the skull would you also refer to as a cheekbone?
the zygomatic bone