Answer:
The postsynaptic cell has many synapses with many presynaptic neurons
Explanation:
Spatial summation is a process of producing an action potential in a neuron with input from multiple presynaptic nerve cells. This process determines whether an action potential will be triggered upon reaching threshold from multiple synapses with presynaptic neurons. Summation of all inputs determines if an action potential will b generated.
1. The heart muscle cells need plenty of oxygen and nutrients so it needs its own blood supply.
2. The heart needs to have a blood supply to get ride of wastes.
Hope that helps. -UF aka Nadia
Describe the advantage of scientists being organised into teams all around the world to work on the human genome project.
Explanation:
the amount of waste in the ponds affect the area beside their and It affect the whole ecosystem,the people who are living their and also affect the livelihood of the people..
<h2>Muscular strength</h2>
Explanation:
Muscles that are elongated while activated (i.e., eccentric muscle action) are stronger and require less energy (per unit of force) than muscles that are shortening (i.e., concentric contraction) or that remain at a constant length (i.e., isometric contraction)
stronger muscle contraction includes:
- Potassium accumulate in the sarcoplasm
- Increase in muscle belly circumference
- Increased stimulus frequency
- Increased requirement
- Lesser proportion of motor neurons to muscle fibers
weaker muscle contraction includes:
- Begin contraction with muscle already 50% contracted
- Circular arrangement of muscle fascicles
- Lower sarcoplasm pH
