adult
analyzing
arm
background
black
blood
body
care
chair
clinic
closeup
donate
donation
donor
expertise
health
hospital
indoors
injecting
injection
laboratory
male
man
medical
microscope
needle
nurse
part
patient
red
sample
science
serum
service
sterile
surgical
syringe
technician
technology
transfused
transfusion
vein
volunteer
woman
young