Examine the slide labeled "small intestine jejunum" and observe the slide under low and medium power. Make a careful drawing of the slide and label the villi. The microvilli would be very difficult to observe in these specimens but try out your microscope skills to see if you can visualize these.
Draw and label the low and medium power and draw a circle by using a petri dish to draw the circle.
In the image below, the villi are shown as finger like projections. The cells on the villi have microvilli but these are very difficult to see.
make 2 clear, labeled drawings under low and medium power. Colour the drawings with pencil crayon and present for evaluation villi and cells are labeled in the drawings. /20
18-20 Exceptional work. Clear, careful labeled drawings that are in circles traced with a petri dish. The drawings are in colour.
12-16. Very nicely done. Clear, careful labeled drawings that are in circles traced with a petri dish. The drawings are not in colour
0-10. This is a good start. The drawings are rushed and not in colour.
attribution :BallenaBlanca october 2015 " Drawing showing the relationship between villi and microvilli of the small intestine. The luminal surface of the enterocytes have microvilli (1 micrometer long) while the cell layer itself is folded to form villi (0.5-1.6 millimeters long) and crypts. Both serve to increase the total absorption surface of the intestine." creative commons, wikipedia. |
