The contractile unit of the muscle fiber is the a. Sarcomere b. Sarcolemma c. My
ID: 82557 • Letter: T
Question
The contractile unit of the muscle fiber is the a. Sarcomere b. Sarcolemma c. Myofilament d. T-system Instructions: Determine the parts of the urinary system numbered 31-40 on the diagrams. Check for the labeling word list on the bock of the page. In muscle fibers, the thick filaments with cross bridges are composed of a. actin, b. collagen, c. elastin, d. myosin The first event to occur during contraction is a. the release of calcium from the sarcoplasmic reticulum b. the generation of nerve impulse c. the uptake of calcium ions into the sarcoplasmic reticulum d. the formation of cross bridges between myosin and actin Which of the following is an organ? a. neuron, b. heart, c. lining of the blood vessel, d. lining of the intestines. Air passing to the lungs in mammals is filtered and cleaned by a. the larynx, b. the epiglottis, c. mucus in the nasal cavities, d. the pharynx The site for exchange of gas in the mammalian lung is the a. para-bronchus b. alveolus c. bronchioler d. tracheole During inspiration the a. the thoracic cavity decreases in size b. pressure in the thoracic cavity is increased c. the diaphragm relaxes d. pressure of the air in the lungs decreases below that of the atmosphere During expiration the a. diaphragm contrast b. chest cavity increases in size c. pressure in the lungs decreases d. none of the above Which sequence represents the flow of air in a mammal? a. nasal cavity, trachea, pharynx, larynx, bronchi b. nasal cavity, larynx, trachea, bronchioles, bronchi c. nasal cavity, larynx, trachea, bronchi, bronchioles, alveoli d. pharynx, trachea, tracheoles, bronchi, alveoliExplanation / Answer
41- answer D- myosin
42. answer- B- generation of nerve impulse. (Motor neuron release acetylcholine which triggers the release of Ca+ calcium ions from the sarcoplasmic reticulum)
43.- answer- B- Heart (Organ- a part of an organism which is typically self-contained and has a specific vital function.) - neuron is a cell that conduts the impulse. lining of blood vessels and intestines are not organs they are nothing but the coating layer of different tissue types.
44. answer- C- mucus in the nasal cavities. (nasal cavity is the first part of respiratory system where the air gets entry and get filtered.
45. answer- B- Alveoli (these are the functional unit of lungs where the gas exchange takes place.)
46. answer - D- pressure of the air in the lungs decreases below that of the atmosphere.
47. answer- D- None of the above.
48. answer - C- Nasal cavity, larynx, trachea, bronchi, bronchioles, alveoli
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.