circulatory Flashcards
Which of the following vessels contains the most smoothe muscle cells arranged in longitudinal pattern in its tunica adventitia? • aorta • arteriole • blood capillary • medium-sized artery • thoracic duct • large vein • venule
large vein
Which of the following statements concerning large veins are true?
• valves are developed
• well-developed internal and external elastic laminae
• adventitia contains smooth muscle cells
• tunica media does not contain elastic fibers
• tunica media contains type I collagen fibers
valves are developped, adventitia contains smoothe muscle cells, and tunica media DOES contain elastic fibers.
venules and medium veins have coll I fibers in adventitia and the medium also have some smoothe muscle cells but large veins have just smoothe muscle cells.
Which of the following are true of pericytes?
• are specialized cardiac muscle cells
• are attached to the outside of endothelial cells
• are specialized smooth muscle cells
• actin, myosin and tropomyosin are contained in their cytoplasm
• are multinucleated
attached to the outside of endothelial cells, and actin,myosin and tropomyosin are contained in their cytoplasm.
Which of the following statements concerning continuous capillaries are true?
• endothelial cells rest on a well-developed basal lamina
• occluding junctions are developed between individual endothelial cells
• abundant in red bone marrow
• endothelial cells contain pinocytic vesicles
• are numerous in striated skeletal muscle tissues
continuous capillaries: endothelial cells on well developed BL occluding jcts pinocytic vesicles abundant in muscle and brain
Which of the following statements concerning cardiomyocytes are true?
• contain less sarcoplasmic reticulum than skeletal muscle fibers
• situated in walls of ventricles and atria
• abundant in epicardium
• gap junctions facilitate communication between them
cardiomyocytes:
contain less SR than skeletal muscle,
are in the walls of ventricle and atria,
gap junction communication
Which of the following statements concerning T tubules are true?
• are evaginations of the sarcoplasmic reticulum
• sequester calcium ions during muscle relaxation
• carry depolarization to the muscle fiber interior
• are found overlying the A-I band junction in cardiac muscle cells
• contain material of the superficial lamina
carry depolarization to the muscle fiber interior,
contain material of the superficial lamina
Which of the following statements concerning intercalated disks are true?
• are found only in smooth muscle
• are autonomic myoneural junctions
• consists of desmosomes, fasciae adherentes and gap junctions
• are located at the M line
• are the middle components of the triads
• represent specialized junctional complexes
have desmosomes, fasciae adherens and gap junctions,
represent specialized junctional complexes
Which of the following statements concerning muscular arteries are true?
• contain more elastic fibers than smooth muscle cells
• tunica media contains smooth muscle cells
• lumen is lined by endothelium
• external elastic lamina is developed
• tunica media contains elastic fibers
- +
Which of the following is true for cardiomyocytes? • centrally located nucleus • mitochondria represent up to 40% of their volume • are striated • multinucleated • lack t-tubules • contain distinct myofibrils • contain diads • contain sacroplasmic reticulum • contain traids
+ + + + - + + + -
CARDIOMYOCYTES central nucleus, may be more than one have diads and t tubules have SR (more than sk. mucle) have distinct myofibrils
