Human physiology worksheet with answers

Free printable Human physiology worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy

Which hormone raises blood calcium levels?

  1. AThyroxine
  2. BInsulin
  3. CParathyroid hormone
  4. DCalcitonin
2.Easy

Which ion triggers contraction by binding to troponin in skeletal muscle?

  1. ACalcium
  2. BPotassium
  3. CSodium
  4. DChloride
3.Easy

Which organ filters the blood to produce urine?

  1. ABladder
  2. BKidney
  3. CLiver
  4. DSpleen
4.Medium

The hormone secretin is released when acid enters the duodenum. What is its main effect?

  1. ABicarbonate secretion from the pancreas
  2. BContraction of the gallbladder
  3. CInsulin release from the endocrine pancreas
  4. DAcid secretion from the stomach
5.Medium

What causes the first heart sound (S1)?

  1. AClosure of the aortic and pulmonary valves
  2. BClosure of the mitral and tricuspid valves
  3. COpening of the aortic valve
  4. DBlood filling the atria
6.Medium

What is the main function of pulmonary surfactant?

  1. ATo carry oxygen across the alveolar wall
  2. BTo trap dust in the bronchi
  3. CTo kill bacteria in the airways
  4. DTo reduce surface tension in the alveoli
7.Hard

According to the length–tension relationship, why does a skeletal muscle fibre produce less force when overstretched?

  1. AThe neuromuscular junction stops working
  2. BThe muscle runs out of ATP when stretched
  3. CActin and myosin overlap less, so fewer cross-bridges form
  4. DCalcium is no longer released from the sarcoplasmic reticulum when stretched
8.Hard

During exercise, blood flow to active skeletal muscle rises greatly. What is the main cause?

  1. AThe parasympathetic system dilates all arteries
  2. BLocal metabolites such as CO₂, H⁺, K⁺ and adenosine dilate the arterioles
  3. CSympathetic stimulation constricts the muscle arterioles via alpha receptors
  4. DThe heart pumps blood only to the muscles

Answer key

  1. 1. C · Parathyroid hormone
  2. 2. A · Calcium
  3. 3. B · Kidney
  4. 4. A · Bicarbonate secretion from the pancreas
  5. 5. B · Closure of the mitral and tricuspid valves
  6. 6. D · To reduce surface tension in the alveoli
  7. 7. C · Actin and myosin overlap less, so fewer cross-bridges form
  8. 8. B · Local metabolites such as CO₂, H⁺, K⁺ and adenosine dilate the arterioles

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