Question

2:34 87) Which of the below make up the pectoral girdle? Al clavicles only B) clavicles and scapulae C) clavicles, scapulae, and humerus D) clavicles, scapulae, humerus, radius, and ulna clavicle, scapula, humerus, radius, ulna, and carpal bones 88) The scapula articulates with the humerus at its A) infraspinous B) scapular D) supraspinous E) elenoid cavity C) olecranon 89) Skeletal muscle contraction begins when calcium ions bind to A) energized cross-bridges B) myosin C actin. D) tropomyosin. E) troponin 90) What is hemoglobin? A) Hemoglobin is a protein inside platelets that when activated makes them sticky. B) Hemoglobin is a lysosomal enzyme inside white blood cells that digests pathogens after phagocytosis. C) Hemoglobin is a protein inside RBCs that helps maintain their flexibility D) Hemoglobin is a protein inside RBC that binds oxygen E) Hemoglobin is an entryme inside RBCs that converts carbon dioxide to carbonic acid BONUS QUESTIONS: 91) In muscle fibers, which organelle releases C2 in order to start contraction of skeletal muscles? A) Endoplasmic reticulum B) golgi apparatus Sarcoplasmic reticulum Di lysosome 92) The neuron will release the neurotransmitter , which leads to action potential being formed on the muscle fiber. This signal goes down to the organelle inside the muscle fiber, which will release calcium in order to start muscle contraction A) epinephrine. B) orepinephrine. C) acetylcholine D) antidiuretic hormone E) acetylcholinesterase 93) Which type of muscle fiber predominates in the leg muscles of endurance athletes, such as long-distance runners A) fasters slow fibers C) intermediate fibers D) Both fast and slow fibers 94) Amuscle fiber or cell is a bundle of A) sacromere B) myofibril muscle Datin 95) The basic unit of muscle contraction is the A) osteon B) sacromere C) actin myosin E) myofibril D

Answer 1

Answer :

87: B)Clavicle and scapula make up the pectoral girdle.

Clavicle attaches with humerus at acromioclavicular joint

88: E) Scapula articulates with humerus at glenoid cavity

89: E) Skeletal muscle contraction begins when calcium ion binds to troponin

90: D) Haemoglobin is a protein inside RBC that binds oxygen

91: C) In muscle fibres sarcoplasmic reticulum releases calcium ion to start muscle contraction

92: C) The neuron will release the neurotransmitter acetylcholine which leads to action potential being formed on the muscle fibres

93: B) Slow muscle fibres predominate in leg muscles of endurance athletes such as long distance runner

94: B) A muscle fibre is a bundle of myofibrils

95: B) The basic unit of muscle contraction is sarcomere .