Question

Give scientific term/one-word answer for the following:
1) The region in our heart that initiates the heartbeat.
2) It acts as a parallel circulatory system.
3) The glands in the human body that do not have ducts.
4) The site of fertilization in human being.
5) A fluid present inside the brain.

pls answer fast pls

Answer 1

Answer:

• SA node.
• gastrointestinal systems.
• Endocrine glands.
• fallopian tube.
• Cerebrospinal fluid .