The defecation reflex involves two postive feedback loops. these loops are the stretch receptors in the rectal walls and the sacral parasympathetic system. Defecation reflex empties the rectum by peristaltic movements push fecal matter from the sigmoid colon into the rectum. Then this distension of the rectal walls stimulates stretch receptors which results in defecation.
Answer:
Radio waves, microwaves, infrared and visible light can all be used for communication.
The right answer for the question that is being asked and shown above is that: "C. Blood flow would be temporarily blocked between heartbeats."Arteries gradually constrict between each heartbeat. This would allow for blood flow would be temporarily blocked between heartbeats.
Answer:
Humans move from one country into another country.
Explanation:
Answer:
A and D
Explanation:
Dolphins have a narrow, torpedo-shaped body to swim easily through water. Their strong, paddle-like flippers also aid in strong swimming.
However dolphins do not secrete gases or attach themselves to the bottom of the sea, so the answers are A and D.
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