Biology, 06.10.2019 04:30 Jadaaaaaaan
Tamara's muscle weakness and fatigue becomes progressively worse over the course of the day. this is a hallmark sign of myasthenia gravis, an autoimmune disorder that affects the ability of a motor neuron to communicate with a muscle fiber. what synaptic events must happen first for excitation to occur?
a. the action potential travels down the t tubules in the sarcolemma and triggers the release of calcium ions from the sarcoplasmic reticulum.
b. calcium binds to tropomyosin, shifting it from the active site on actin, allowing cross bridge formation to occur as myosin binds to the active site.
c. acetylcholine is released from the axon terminal and diffuses across the synapse to bind to a receptor in the surface of the motor end plate.
d. sodium ions from the extracellular fluid diffuse into the cytosol of the muscle fiber, triggering the generation of an action potential in the sarcolemma.
Answers: 1
Biology, 22.06.2019 05:00
Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.
Answers: 2
Biology, 22.06.2019 05:00
Match each term to its best definition? sedimentary depositional enviornment
Answers: 1
Biology, 22.06.2019 10:30
All ova contain sex chromosomes corresponding to: x y xx xy
Answers: 2
Tamara's muscle weakness and fatigue becomes progressively worse over the course of the day. this is...
Mathematics, 27.02.2020 17:58
Computers and Technology, 27.02.2020 17:58
Mathematics, 27.02.2020 17:58
Computers and Technology, 27.02.2020 17:59
Social Studies, 27.02.2020 17:59
Mathematics, 27.02.2020 17:59