By M. Kent. Whitman College.
The blood delivers oxygen (O2) to the tissues and picks up carbon dioxide (CO2) for transport to the lungs buy plavix 75mg otc. Note the lymphatic capillaries cheap 75 mg plavix with visa, which aid in tissue drainage. Note that even when the capillary exchange process is increase greatly during periods of activity. For example, most efficient, some water is left behind in the tissues. The volume of blood flowing to a particular organ tissues. The lymphatic system, discussed in Chapter 16, can be regulated by changing the size of the blood vessels collects this extra fluid and protein and returns them to supplying that organ. An increase in a blood vessel’s diameter is called va- sodilation. This change allows for the delivery of more Checkpoint 15-13 As materials diffuse back and forth between blood to an area. Vasoconstriction is a decrease in a blood the blood and tissue fluid across the capillary wall, what force vessel’s diameter, causing a decrease in blood flow. What force helps to draw materials into the capillary? A vasomotor center in the medulla of the brain stem regulates vasomotor activities, sending The Dynamics of Blood Flow its messages through the autonomic nervous system. Blood flow is carefully regulated to supply tissue needs Blood flow into an individual capillary is regulated by without unnecessary burden on the heart. Some organs, a precapillary sphincter of smooth muscle that encircles such as the brain, liver, and kidneys, require large quan- the entrance to the capillary (see Fig. The requirements of some tis- ter widens to allow more blood to enter when tissues sues, such as the skeletal muscles and digestive organs, need more oxygen. BLOOD VESSELS AND BLOOD CIRCULATION 319 Checkpoint 15-14 Name the two types of vasomotor changes. At the same time, chest expansion Checkpoint 15-15 Where are vasomotor activities regulated?
However buy cheap plavix 75mg, by the time she reached full sists because she does not feel she needs them discount 75 mg plavix visa. Most of the balance studies in adults and children involve an assessment of postural stability by measuring the impact of different sensory systems, such as eyesight, the in- ner ear vestibular system, and joint sensory position feedback. The gross motor function measure (GMFM) has become a com- mon clinical evaluation tool for children with CP. Although this test does not specifically evaluate and measure ataxia, it has a significant component, es- pecially in domain 4, where tasks such as single-leg stands are evaluated. These tasks require separating out balance from motor control problems based on subjective evaluation of these children. Also, on gait analysis, tem- poral spatial characteristics such as step length and cadence tend to have high variability in children with significant ataxia. Children with only spasticity but good balance have less variability than normal children, and those with predominantly ataxia will have much higher variability. This variability is also true of trunk motion and the ability to walk in a straight line. Understanding balance deficits during walking is difficult be- cause momentum can make unstable children look much more stable than they really are. An example is a child who seems to walk very well while walking; however, every time she tries to stop, she has to grab the wall or fall to the floor. This is the analogy of riding a bicycle where the rider is very stable due to the momentum of motion. However, if the rider stops the motion and tries to sit on the bicycle, she becomes very unstable.
