10 Questions
What is the size of the human heart?
Approximately the size of a closed fist
What is the function of heart valves?
To prevent backflow of blood
Which layer makes up the wall of the heart?
Endocardium, myocardium, and epicardium
How many chambers does the heart of most mammals, including humans, have?
Four chambers
In what location is the heart typically found in vertebrates?
In the mediastinum, between the lungs
Which cells send signals to the suprachiasmatic nuclei for circadian adjustment?
Retinal photosensitive ganglion cells
What is the primary function of eyes?
To process visual detail
In higher organisms, what part of the eye collects light from the surrounding environment?
A complex optical system
What are the eye-spots called that may be set into a pit to reduce the angle of light entering?
Pit eyes
Which area of the brain controls the pupillary light reflex?
The pretectal area
Test your knowledge on the anatomy and function of the heart in the circulatory system. Learn about the four chambers of the heart and its role in pumping blood and distributing oxygen and nutrients throughout the body.
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