1. The human heart has A. 2 chambers B. 3 chambers C. 4 chambers 2. The chemicals that transmit a signal across the synapse are called A. hormones B. neurotransmitters C. inhibitors 3. Living organisms require A. Food and water B. Compatible weather and terrain C. Shelter D. All of the above 4. Red blood cells contain A. hemoglobin B. thromboglobin C. myoglobin D. immunoglobin E. all of these 5. Senory input is sent from the _______ to the ______ nervous system A. Central, peripheral B. Peripheral, central C. sympathetic, parasympathetic 6. The Rh factor is A. measurement of blood pressure B. a blood cell antigen C. a type of antibody 7. Sensory neurons include dendrites that A. receive environmental information B. provide logical analyses C. directly stimulate muscle 8. Our left and right brain hemispheres share information via the A. hippocampus B. corpus callosum C. meninges D. limbic system 9. Neurons send a signal using their A. dendrites B. soma C. axon 10. CO2 in blood A. maintains blood pH B. interferes with oxygen delivery C. regulates iron levels 11. Skin cells contain neurons that respond to A. pain B. pressure C. heat D. all of these .

1. 1. The human heart has
A. 2 chambers
B. 3 chambers
C. 4 chambers
2. The chemicals that transmit a signal across the synapse are called
A. hormones
B. neurotransmitters
C. inhibitors
3. Living organisms require
A. Food and water
B. Compatible weather and terrain
C. Shelter
D. All of the above
4. Red blood cells contain
A. hemoglobin
B. thromboglobin
C. myoglobin
D. immunoglobin
E. all of these
5. Senory input is sent from the _______ to the ______ nervous system
A. Central, peripheral
B. Peripheral, central
C. sympathetic, parasympathetic

2. 6. The Rh factor is
A. measurement of blood pressure
B. a blood cell antigen
C. a type of antibody
7. Sensory neurons include dendrites that
A. receive environmental information
B. provide logical analyses
C. directly stimulate muscle
8. Our left and right brain hemispheres share information via the
A. hippocampus
B. corpus callosum
C. meninges
D. limbic system
9. Neurons send a signal using their
A. dendrites
B. soma
C. axon
10. CO2 in blood
A. maintains blood pH
B. interferes with oxygen delivery
C. regulates iron levels
11. Skin cells contain neurons that respond to
A. pain

3. B. pressure
C. heat
D. all of these