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Week 1-6
SCI221 week 7
Question | Answer |
---|---|
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 |