Question

question 18
1 pts
several kinds of tissues working together are termed a(n):
○ plasma membrane.
○ organ.
○ organism.
○ organ system.

question 19
1 pts
the abdominal quadrants are located with what structure as their midpoint?
○ umbilicus
○ pubic bone
○ xiphoid process
○ iliac crest

question 20
1 pts
the number of abdominal regions is:
○ three.
○ five.
○ seven.
○ nine.

Explanation:

Question 18

To solve this, we recall the levels of biological organization. Tissues are groups of cells, and when multiple tissues work together for a specific function, they form an organ. A plasma membrane is a cell structure, an organism is a whole living entity, and an organ system is multiple organs working together. So the correct answer is organ.

The abdominal quadrants are divided using the umbilicus (navel) as the midpoint. The pubic bone is lower, the xiphoid process is upper, and the iliac crest is part of the pelvic region. So the umbilicus is the midpoint for abdominal quadrants.

The abdominal regions are divided into nine regions: three rows (top, middle, bottom) and three columns (left, middle, right). So the number of abdominal regions is nine.

Answer:

B. organ

Question 19