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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 |
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ShavontaeSmith1
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