Question

The chemicals which are released at the synaptic junction are known as
A) Cerebrospinal fluid
B) Hormones
C) Neurotransmitters
D) Lymph

Answer 1

As we know synapse is a junction between two neurons or a neuron and a target or effector cell such as a muscle cell. It permits transmission of either electrical or chemical signals. It is formed between presynaptic and postsynaptic neurons and it is also known as the neuromuscular junction between a neuron and muscle.

Complete answer:
Neurotransmitters are the brain chemicals that help in communicating information throughout our brain and body. They relay signals between nerve cells which are called neurons. They are the chemicals which allow the transmission of signals from one neuron to the next across the synapses.
Cerebrospinal fluid is a clear, colorless body fluid which is found within the tissue that surrounds the brain and spinal cord of vertebrates. It replaces the body fluid which is found outside the cells of all the bilateral animals.
Hormones are the body's chemical messengers that travel in your bloodstream to tissues or organs. They work slowly, over time and also affect many different processes like growth and development, metabolism, reproduction and mood.
Lymph is a fluid that flows through the lymphatic system which is basically a system that is composed of lymph vessels and intervening lymph nodes whose function is to return fluid from the tissues to the central circulation.
Hence option A, B and D are incorrect.

So, the correct answer is option C) which is neurotransmitters.

Note:
Different types of neurotransmitters are excitatory neurotransmitters, inhibitory neurotransmitters that has inhibitory effects on the neurons and have fewer chances of the neuron firing an action potential, examples are serotonin and gamma-aminobutyric acid and modulatory neurotransmitter. Common neurotransmitter diseases are Parkinson's disease, Alzheimer's disease and depression.