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Once fertilization has occurred, the activities of development begin. The first activity is ___
an increase in cell number
In the human, this germ cell layer gives rise to the many organ systems, including the skeleton, skeletal muscles, wall of GI organs, urinary system and circulator system.
53. What is the name of the circuit that supplies blood to the brain, heart and gastrointestinal tract.
48. What is true about heart valves?
they enforce a one-way blood flow through the heart, operate passively, and separate the atria
50. The pulmonary trunk and arteries are color-coded ______ on models and in pictures, because they carry ____ blood:
46. The shapes and thickness of the walls of the right ventricle compared to the left are:
different; Left ventricle is egg-shaped (round in cross section) with thicker walls
Development of male reproductive structures depends on which events?
Secretion of male hormones parentally and lasting in to the first few months after birth
17. The constancy of the chromosome number from one cell generation to the next is maintained through_____:
18. Spermiogenesis involves the _____:
formation of a functional sperm by the stripping away of superfluous cytoplasm
85. Olfactory receptor cells differ from all other receptors for special senses in that they____.:
C. are neurons
110. Tinnitis, vertigo, and gradual hearing loss typify the disorder called ______.:
D. meniere's syndrome
111. Light passes through the following structures in which order?
C. cornea, aqueous humor, lens, vitreous humor
120. This part of the peripheral nervous system controls smooth muscle, cardiac muscle, and glands:
B. autonomic nervous system
121. The surface of the cerebral hemispheres consists of ridges and grooves.The shallow grooves are called ______.:
122. The central sulcus of each cerebral hemisphere separates the ______.:
B. frontal and parietal lobes
127. Three meninges cover the brain and spinal cord. The innermost one is called the ______.:
129. Which of the choices below describes the ANS?
A. motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands
130. Which of the following describes the nervous system integrative function?:
C. analyzes sensory information, stores info, and makes decisions
132. An impulse from one nerve cell is communicated to another nerve cell via the _______.:
133. Collections of nerve cell bodies outside the central nervous system are called ________:
135. The substance released at axon terminals to propagate a nervous impulse is called an_______.:
137. The vital centers for the control of heart rate, respiration, and blood pressure are located in the medulla _______.:
143. A muscle group that works with and assists the action of a prime mover is a ________.:
145. The actual contractile units of muscles extend from Z disc to Z disc. They are _______.:
149. The function of the neuromuscular junction is to ______:
D. convey an impulse from the nervous system to skeletal muscle
150. These nervous system cells are highly specialized to transmit messages throughout the body:
156. What is the main factor that determines the power of a muscle?
C. the total number of muscle cells available for contraction
157. What is a muscle that provides the major force for producing a specific movement called?
A. an agonist
158. When the term biceps, triceps, or quadriceps forms part of a muscle's name, what does it tell you about the muscle?
B. the muscle has two, three, or four origins respectively
159. Which of the following statements is true regarding the total number of skeletal muscles in the human body?
B. there are over 600 muscles in the body
160. During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to ______:
B. lactic acid
161. What is the most distinguishing characteristic of muscle tissue?
C. the ability to transform chemical energy into mechanical energy
162. Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?
D. a long relaxing swim
164. Which of the following is the correct sequence of events for muscle contractions?
B. motor neuron action potential (I didn't write them all, but this is the first one)
165. The main effect of the warm-up period of athletes, as the muscle contractions increase in strength, is to _______.:
C. enhance the availability of calcium and the efficiency of enzyme systems
169. Rigor mortis occurs because _______.:
A. no ATP is available to release attached actin and myosin molecules
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