Which of the following statement(s) are true with respect to graded potentials?a. A graded potential has a threshold Graded potential amplitudes decay over distances b. Graded potentials can summate in space and time An action potential is required to generate a graded potentialc. Graded potential amplitude increases with stimulus strengthd. Graded potentials are not regenerative

Following statements are correct

A graded potential has a threshold Graded potential amplitudes decay over distances

Graded potentials can summate in space and time

Graded potential amplitude increases with stimulus strength

Explanation:

Graded potential is generated in a neuron when ions enter or exit through the ligand gated channels. In general, this potential decreases with time before reaching axon. Signals that reach the graded potential, determine whether the amplitude of the potential will reach the threshold and hence causes action potential. Graded potential travel only over a short distance and is either depolarization or hyperpolarization. Their strength reduces with time as the charged ions move out of the membrane. They summate temporally or spatially

Graded potentials spread by passive means i.e spreading electronically to neighboring membrane regions.

Hence, the correct statements are

A graded potential has a threshold Graded potential amplitudes decay over distances

Graded potentials can summate in space and time

Graded potential amplitude increases with stimulus strength

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.