The opening of the uterus is referred to as the _________________.

Color blindness usually results from a decrease in the number of _______________.

Use the figure above which of the blood vessels in the human cardiovascular system contain deoxygenated blood?

In which one of the following locations does fertilization not implantation usually occur?

Bones are connected to other bones across a joint by and to muscles by .

Arrange in the proper sequence the following events as they occur in the ossification of long bone development. Cartilage starts to break down and the periosteum begins to develop. Osteoblasts secrete osteoid to make hard bones. Blood vessels transport osteoblasts into the area to be ossified. Chondroblasts create a model of long bones from hyaline cartilage. Osteoblasts become osteocytes as the bone lengthens and widens.  

New sperm cell synthesis takes place in the ______________ and matures in the _______________.

Which one of the following statements is TRUE regarding Schwann cells? 

Which of the following is capable of producing an action potential (AP) in the human body? Select ALL that apply.   

Using the figure (A to D) above, 1) Identify the structure at the cellular level. 2) Identify the structure at the organ level. 3) Identify the structure that links the muscle to the bone. 4) Out of four human tissue types what tissue surrounds the fascicle? tissue.