- Nervous system begins to control body functions
- Organs in the digestive system form.
- Bone replaces cartilage in the skeleton
- The lungs begin rhythmic movement
How does the timing of meiosis in humans differ in males and females?
- In females it begins prior to birth, while in males, it begins after birth.
- In females it ends at the end of puberty, while in males, it ends at birth.
- In females it is completed as puberty begins, while in males, it starts at puberty.
- In females it continues throughout life, while in males, it stops at puberty.
Which of the following best describes an example of a nonspecific internal response to pathogens?
- Fever increases metabolism, speeding up the body’s reaction to the pathogens.
- Mucus traps the pathogens and prevents them from invading the body.
- Lymphocytes recognize the pathogens and destroy them.
- Dead skin cells provide a barrier between the pathogens and the body.
During a cell-mediated immune response, which of the following describes how infected cells are detected by the immune system?
- The infected cell’s membrane shows some of the antigens of the invading pathogen.
- The pathogen engulfs and destroys healthy cells, leaving antigens behind.
- Antibodies bind with the pathogen’s antigens, causing inflammation and swelling.
- Memory B cells recognize the cell shape that results from infection by specific pathogens.