List the four steps of the contraction cycle in order of occurrence. What is needed for these steps to continuously repeat?
What will be an ideal response
ATP hydrolysis, attachment of myosin to actin forming crossbridges, the power stroke, then detachment of myosin from actin. The cycle will continue as long as ATP and calcium ions are available.
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Aged and damaged erythrocytes are broken down by macrophages in the
A) spleen. B) liver. C) bone marrow. D) digestive tract. E) spleen, liver, and bone marrow.
The ____________________ serves as a "relay station" for preliminary processing of sensory input
Fill in the blank(s) with correct word
As the thoracic cavity enlarges, the lungs enlarge
Indicate whether the statement is true or false
Which statement is true regarding pseudo-stratified ciliated columnar epithelium?
A) It is well-suited for extreme stretching. B) It contains only one layer of cells. C) Its cells are predominantly cube shaped. D) It consists of many layers of cells.