The First Radiograph Produced by Roentgen, of His Wife's Hand

question 9

Multiple Choice

The first radiograph produced by Roentgen, of his wife's hand, required an exposure time of:

• A) 15 seconds
• B) 150 seconds
• C) 15 minutes
• D) 150 minutes

---

Definitions:

Deuterostomes

A group in the animal kingdom characterized by the development of the anus from the first opening in the embryo, with the mouth developing later.

Embryonic Development

The process through which an embryo forms and develops from fertilization to birth.

Cephalization

Having a well-recognized anterior head with a brain and sensory receptors.

Nematocysts

Specialized cells in the tentacles of cnidarians (such as jellyfish) that discharge a barbed or venomous coiled thread in response to touch.