What does it mean when we say cardiac muscle contraction is a graded contraction?

Which of the following is a correct sequence (in chronological order of occurrence) within excitation-contraction coupling? a. Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter binds to receptors in the post-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft   b. Neurotransmitter binds to receptors in the post-synaptic membrane, Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft   c. Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft, Neurotransmitter binds to receptors in the post-synaptic membrane

How does an event (action potential) on the outside of a muscle fiber trigger the contractile process on the inside?

Which of the following is NOT correct regarding muscle contraction? O Ca++ in the sarcoplasm returns to the nucleus to be stored ATP needs to be present for muscle relaxation A neurotransmitter is released at the neuromuscular junction ATP needs to be present for muscle contraction