Question

6. a correct order of events of a muscle contraction stars correct Which of the following (A-E) represents with the binding of ATP to the myosin head? (I point) 9. 1- () The myosin head binds to the actin filament to form a cross bridge myosin and actin separate (3) ATP is hydrolyzed to ADP and P (4) The power stroke is initiated A. 1, 2, 3,4 B. 2, 1. 4, 3 C. 3, 2, 1, 4 D. 2, 3, 1,4 E. 4,3,2,I 10. Give 3 functions of the skeletal system. (3 points) I1. Endochrondral ossification involves the production of bone tissue within a model composed of (I point) 12. W hich type of cell is responsible for bone resorption (breaking down bone and releasing minerals into the bloodstream? (1 point) A.Osteoblasts B. Osteoclasts C.Osteocytes D.Chondrocytes E. Erythrocytes Respiration (10 points) 12. What features are common to all animal respiratory systems to increase the eff exchange? (2 points) 13. How does countercurrent exchange work to increase the efficiency of gas exchange in a fish gill? 2 points) 14. Which of the following correctly describes the passage of air through the human respiratory system? (1 point) A. Trachealarynx-esophagus bronchi-bronchioles- >alveoli B. Larynx trachea -esophagus ->bronchi ->bronchioles-alveoli C. Trachealarynx >bronchioles ->bronchi -alveoli D. Larynxtrachea>bronchi ->bronchioles ->alveoli E. Trachea larynxbronchi-bronchioles ->alveoli , Pointe 15. Which of the following statements about the respiratory system of birds is correct? (I point) A. B. C. Fresh air can enter the bird 's trachea at the same time spent air is leaving through the trachea The large size of the anterior and posterior air sacs greatly increase the surface area for gas exchange between the blood and the air Birds have an almost continuous and unidirectional flow of air through their lungs by virtue of having air tubes (parabronchi) instead of alveoli Although it is more complex, the bird respiratory system is less efficient than the human respiratory system

Answer 1

9. which of the following (A-E) represents a correct order of events of a muscle contraction starting with the binding of ATP to the myosin head?

B . 2,1,4,3

10. Give 3 function of the skeletal system

1. Mechanical: they shape and support your body. Muscles attach to bones and thogether they enable body movement.
2. Protective:bones secure inward organs e.g. the skull ensures the mind and the ribcage secures the lungs and the heart. It likewise ensures the marrow it contains.
3. Metabolic: bones deliver platelets from its marrow, a similar marrow can store vitality (lipids). Bones likewise store (basic) minerals, for example, calcium and phosphorus.

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