In each topic, you will find a laboratory exercise, and brief description of the histological material.
Includes cytology, epithelium, connective tissue, cartilage, bone and bone formation, blood, hematopoeisis, muscle, nervous tissue, cardiovascular system, lympathic and immune system, integument, upper GI, lower GI, liver, gallbladder, pancreas, respiratory system, urinary system, endocrine, male reproductive, female reproductive
Interactive game from sciencenetlinks. Put Arnold's organ systems together before time runs out (covers digestive, cardiovascular/respiratory, nervous systems). Not super detailed, but could still be fun as a quick activity even for upper grades.
"A free resource to help teachers and students to gain a deeper understanding of how the body works has been launched by The Physiological Society in partnership with the University of Liverpool.
The resource, a Massive Open Online Course (MOOC), has been specifically designed to support the A-level Biology curriculum, with a focus on the respiratory, cardiovascular and nervous systems."