b is the correct answer. hope this helps
Pulmonary valve and Aortic valve
During systole, the aortic and pulmonic valves open to permit ejection into the aorta and pulmonary artery.
<h3>What happen when ventricles contract ?</h3>
When the right ventricle contracts, blood is forced through the pulmonary semilunar valve into the pulmonary artery
- Then it travels to the lungs. In the lungs, the blood receives oxygen then leaves through the pulmonary veins. It returns to the heart and enters the left atrium.
- When the left ventricle contracts, it forces blood through the aortic semilunar valve and into the aorta. The aorta and its branches carries the blood to all the body's tissues.
Learn more about Ventricles here:
brainly.com/question/1569437
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Answer:
Neurotransmitter are produced by nervous system while hormones are produced by endocrine glands
Neurotransmitter are secreted in synaptic cleft while hormone are secreted to blood
Neurotransmitter are quick and short in action while hormones are slower and last longer
Similarities, they are both chemical messengers
