What causes normal heart sounds?
What will be an ideal response?
heart valve closure
You might also like to view...
Tendons and ligaments consist primarily of which protein?
A. Keratin B. Elastin C. Fibrin D. Actin E. Collagen
List 3 ways to control insects in cattle
What will be an ideal response?
Which of the following statements are true regarding human muscles?
A) All human muscles have both slow and fast fibers. B) Fast fibers are found in the calf muscles. C) Eye and hand muscles are composed of fast fibers. D) Back muscles are mostly composed of endurance fibers. E) both C and D
Although the heart beats without nervous innervation, ________ can modify the heart rate
A) hormones B) various chemicals and ions C) impulses from the autonomic nerves D) impulses from the autonomic nerves, hormones, and various chemicals and ions