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Week 1-6

SCI221 week 7

QuestionAnswer
Which cells of the skin are filled with a tough, fibrous protein and account for most of the epidermal cells of the skin? Keratinocytes
Which skin layer is called the barrier area? Stratum corneum
The hair papilla consists of _____ tissue. dermal
Which is not part of a hair? Lanugo
Which skin layer has cells that look prickly because of the desmosomes that join the cells together? Stratum spinosum
In which skin layer does the process of keratinization begin? Stratum granulosum
The nail body forms at the nail root, which has a matrix of proliferating cells from the _____________ that enables the nail to grow continuously. stratum basale
Fingernail growth is the result of the mitosis of the cells in the stratum: germinativum.
Which skin layer contains closely packed, clear cells that contain a gel-like substance called eleidin? Stratum lucidum
The hair follicle is found in the: dermis.
Smooth muscles that produce goose pimples when they contract are the _____ muscles. arrector pili
Apocrine sweat glands can be found in all of the following areas except the: soles of the feet.
Which cells of the skin act as a type of antigen-presenting cell in the skin? Dendritic cells
The waxy secretion in the external ear canal is: ceruminous.
Hair: is all of the above.
Why is cartilage slow to heal? Both B and C
Why are osteocytes spread out in bone tissue? Formation of osteoid spreads out the osteoblasts that formed the ossification centers.
Which of the following bones is (are) formed by intramembranous ossification? the flat bones of the cranium
Bones grow in length due to activity in the ________. epiphyseal plate
Bones grow in diameter due to bone formation ________. In the endosteum or periosteum
Which of the following represents the correct sequence of zones in the epiphyseal plate? calcification, maturation, proliferation, reserved
In endochondral ossification, what happens to the chondrocytes? They die in the calcified matrix that surrounds them and form the medullary cavity.
Select the answer that best describes the axial skeletal structure. All of the above
Adipocytes, found in the yellow bone marrow, stores and releases ____________________________ for energy. fat and triglycerides
Which function of the skeletal system would be especially important if you were in a car accident? protection of internal organs
Without red bone marrow, bones would not be able to ________. make blood cells
Which of the following provide flexibility and smooth surfaces for movement? Cartilages
The fontenelles of an infant's skull consists of fibrous membrane
Which statement below is correct regarding fontanelles? All of the above
Hematopoietic stem cells that are found in red bone marrow can develop into a variety of different blood cells, including red blood cells, white blood cells, and platelets. True
Which of the following is not a function of muscles? storage
The joints between the articulating surfaces of the vertebral processes are classified as what type of joint? gliding
The minimal level of stimulation required to cause a fiber to contract is called the threshold stimulus.
Some synovial joints contain a closed pillow-like structure called a(n) bursa
If a structural classification is used, joints are named according to the type of _____ tissue that joins the bones together. connective
A contraction in which muscle length remains the same but muscle tension increases is called an isometric contraction.
The more muscle fibers contracting at the same time, the stronger the contraction of the entire muscle. The number of muscle fibers contracting depends on how many motor units are recruited
Anaerobic respiration results in the formation of an incompletely catabolized molecule called lactate
The four kinds of protein that make up myofilaments are myosin, actin tropomyosin, and troponin.
Three phases of the twitch contraction are the latent period, contraction phase, and relaxation phase.
Which of the following is not among the structures that characterize synovial joints? tendons
Which type of movement occurs between the carpal and tarsal bones and between the articular facets of adjoining spinal vertebrae? gliding
Synovial joints are freely movable
The muscle’s ability to stretch or extend and to return to its resting length is called extensibility.
The contractile unit of a muscle cell is the sarcomere.
The joint present during the growth years between the epiphyses of a long bone and its diaphysis is the synchrondrosis.
The structure of the knee joint permits movements of flexion and extension.
The shoulder joint is an example of a _____ joint. The shoulder joint is an example of all of these.
_____ occurs when the foot is tilted upward, thus decreasing the angle between the top of the foot and the front of the leg. Dorsiflexion
According to the sliding filament theory actin moves past myosin.
Joints joined by fibrocartilage are called symphyses.
Which of the following is an example of a uniaxial joint? elbow joint
Muscle tone is maintained by negative feedback mechanisms.
Which subtype of fibrous joints is found only in the skull? suture
Synarthrotic joints are immovable.
Exercise may cause an increase in muscle size called hypertrophy.
Which structure allows the electrical signals to travel along the sarcolemma and move deeper into the cell? transverse tubule
Repeated stimulation of muscle in time lessens its excitability and contractibility and may result in fatigue
The energy required for muscular contraction is obtained by hydrolysis of ATP
The largest and most commonly injured joint in the body is the _____ joint. knee
Created by: ShavontaeSmith1
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