9 Questions
What maintains the electrons in their orbits around the nucleus?
Electrostatic force and centrifugal force
Why is an atom neutral?
It has an equal number of negative charges (electrons) and positive charges (protons)
What is the atomic weight or mass number of an atom?
The number of protons and neutrons in the nucleus
What causes the electrons to be pulled toward the protons in the nucleus?
Electrostatic force
What is the atomic number of an atom?
The number of protons inside the nucleus and/or the number of electrons outside the nucleus
What is the normal range for platelet count in the blood?
250,000 - 500,000 / mm3
What is the origin of platelets?
Bone marrow
What is the primary cause of immediate vasoconstriction of injured blood vessels?
Nervous reflex action by pain
What is the first step in platelet plug formation?
Platelets adhesion
Study Notes
Atomic Structure
- The electrically charged protons in the nucleus attract electrons, maintaining them in their orbits around the nucleus.
- An atom is neutral because it has an equal number of positively charged protons and negatively charged electrons.
Atomic Number and Mass
- The atomic number of an atom is the number of protons in the nucleus.
- The atomic weight or mass number of an atom is the total number of protons and neutrons in the nucleus.
Platelets
- The normal range for platelet count in the blood is 150,000 to 450,000 platelets per microliter.
- Platelets originate from megakaryocytes in the bone marrow.
- The primary cause of immediate vasoconstriction of injured blood vessels is the release of thromboxane A2 and endothelin-1, which are potent vasoconstrictors.
- The first step in platelet plug formation is the adhesion of platelets to the injured blood vessel wall, facilitated by von Willebrand factor.
Test your knowledge of X-ray and radiation protection with this physics quiz. Explore topics such as ionization processes, ionizing vs non-ionizing radiation, the use of X-rays as a diagnostic tool, and the structure of the atom. Challenge yourself with questions about the direct and indirect action of radiation and the radio-sensitivity of cells.
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