The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. what is a cross bridge? hints the cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. what is a cross bridge? a myosin head bound to actin atp bound to a myosin head troponin bound to tropomyosin calcium bound to troponin

As hinted in the question, the cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. A cross bridge is formed when a myosin head bound to actin. The cross bridge cycle depends on the presence of calcium ions

g1

choices:

a. g2. b. g1. c. m

cell division has two checkpoints namely, g1

checkpoint and spindle assembly checkpoint. the checkpoint which determines if

division has properly occurred is the g1 checkpoint. at this point, is a damage

in the dna is detected or  the has not reach the optimum size, the cell is

stopped in g1 and is not allowed to proceed to further process.

source:

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

i didn't have the answer choices , but i tried my best.