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Lecture exam 2 HW
AP 1 lecture exam 2 Homework
| Question | Answer |
|---|---|
| _____are stem cells that develop into osteoblasts. | Osteogenic cells |
| A condition in which bone becomes riddled with holes is called | Osteoporosis |
| After a fracture of the diaphysis has healed, the thickened region that results is called the | External callus |
| Cells that secrete the organic components of the bone matrix are called | Osteoblasts |
| Endochondral ossification begins with the formation of a(n) | Cartilage model |
| How would removing hydroxyapatite from bone matrix affect the physical properties of a bone? | The bone marrow would be more flexible |
| Primary ossification centers develop in long bones in the | Diaphysis |
| Secondary ossification centers occur | In the epiphyses |
| Small, oddly shaped bones that fill gaps between bones of the skull are called ____ bones | Sutural |
| The carpal bones are examples of ____ bones | Short |
| The central canal of an osteon contains | Blood vessels |
| The humerus is an example of a(n) bone. | Long |
| The narrow passageways that contain cytoplasmic extensions of osteocytes are called | Canaliculi |
| The space occupied by an osteocyte is called a | Lacuna |
| The structural units of mature compact bone are called | Osteons |
| The tip of a long bone is called the | Epiphysis |
| The type of bone that is adapted to withstand stresses that arrive from many directions is bone. | Spongy |
| Through the action of osteoclasts, | Bony matrix is dissolved |
| Which of following is a function of the skeletal system? | All of the answers correct |
| Which of the following bones is classified as "irregular" in shape? | Vertebrae |
| A fascicle is | a group of muscle fibers that are encased in the perimysium. |
| Active sites on the actin become available for binding after | calcium binds to troponin. |
| At rest, active sites on the actin are blocked by | tropomyosin molecules. |
| In a sarcomere, thick filaments are linked laterally by proteins of the | I band |
| In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases | Calcium ions |
| Muscle fibers differ from "typical cells" in that muscle fibers | have many nuclei. |
| Muscle tissue, one of the four basic tissue groups, consists chiefly of cells that are highly specialized for | Contraction |
| Receptors for acetylcholine are located on the | Motor end plate |
| Synaptic vesicles contains acetylcholine are released by ____ when the action potential arrives | Exocytosis |
| The area in the center of the A band that contains no thin filaments is the | H band |
| The delicate connective tissue that surrounds the skeletal muscle fibers and ties adiacent muscle fibers together is the | Endomysium |
| The dense layer of connective tissue that surrounds an entire skeletal muscle is the | Epimysium |
| The narrow space between the synaptic terminal and the muscle fiber is the | Synaptic cleft |
| The region of the sarcomere that always contains thin filaments is the | I band |
| The repeating unit of a skeletal muscle fiber is the | Sarcomere |
| The type of contraction in which the muscle fibers do not shorten is called | Isometric |
| When acetylcholine binds to receptors at the motor end plate, the end plate membrane becomes | more permeable to sodium ions. |
| Which of the following acts as an ATPase during the contraction cycle of muscle? | the head portion of the myosin molecule |
| Which of the following become connected by myosin cross-bridges during muscle contraction? | thin filaments and thick filaments |
| Which of the following best describes the term Z line? | thin filaments are anchored here |
| ___ are cells in the epidermis that are a part of the immune system | Langerhan cells |
| ___ sweat glands are widely distributed across the body surface, ____ glands are located wherever hair follicles exists, and ____ sweat glands are found only in a few areas | Merocrine; sebaceous; apocrine |
| A surgical incision parallel to the lines of cleavage | closes and heals with relatively little scarring. |
| Accessory structures of the skin include all of the following, except | Epidermis |
| An important vitamin that is formed in the skin when it is exposed to sunlight is | Vitamin D |
| During repair of the integument, fibroblasts follow areas of new capillary growth and produce ___ tissue | Granulation |
| Each of the following is a function of the integumentary system, except | synthesis of vitamin C. |
| Stretch marks occur when | the skin is so extensively stretched that its elastic limits are exceeded. |
| The ___ glands in the axilla become active at the time of puberty | Apocrine sweat |
| The ___ the harmful effects of sunlight. in keratinocytes protects the epidermis and dermis from | Melanin |
| The layer of stem cells that constantly divide to renew the epidermis is the | stratum granulosum. |
| The layer of the skin that contains the blood vessels and nerves that are closest to the surface of the skin is the. ____ layer | Papillary |
| The laver of the skin that provides a barrier against bacteria as well as chemical and mechanical injuries is the | Epidermis |
| The primary pigments contained in the epidermis are | carotene and melanin. |
| The protein that permits stretching and recoiling of the skin is | Elastin |
| The tough superficial layer of the epidermis is known as the | stratum corneum. |
| The type of cells that form the strata in the epidermis are | keratinocytes. |
| Variations in hair color reflect differences in the pigment produced by | melanocytes. |
| While walking barefoot on the beach, Joe stepped on a thorn that penetrated through the sole of his foot to the dermis. How many layers of epidermis did the thorn penetrate? | 5 |
| Wrinkles in elderly individuals are the result of | loss of elastic filaments in the reticular layer of the dermis. |
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knsudderth